Can you do a full scan and post the results? may not be an engine fault.

 

I am getting spark at the spark plug, just not enough gas.
When I open door, fuel pump primes for about 3 seconds.
After trying to start engine, I depress valve nipple on fuel rail and only a little puff of fumes comes out, I would say less than 5 psi. (haven tested pressure with a gouges yet.)

 

Thursday,08,January,2015,16:43:50:37625
VCDS -- Windows Based VAG/VAS Emulator
VCDS Version: 14.10.0.0
Data version: 20141022


VIN: WVGBC67L94D003797 License Plate: JAN82014
Mileage: 12060km-7493mi Repair Order:



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 7L (7L - VW Touareg (2003 > 11/2006))
Scan: 01 02 03 05 06 08 09 11 13 15 16 17 18 19 1C 22 29 32 34 36
37 39 3C 46 47 55 56 57 64 65 68 69 6C 6D 6E 75 76 77

VIN: WVGBC67L94D003797 Mileage: 12060km-7493miles
-------------------------------------------------------------------------------
Address 01: Engine Labels: 022-906-032-BMX.lbl
Part No SW: 022 906 032 BF HW:
Component: MOTRONIC ME7.1.1G 0005
Coding: 0001133
Shop #: WSC 31414 000 00000
VCID: 50AF7AB7C071CAA1BFB-5124

No Faults Found
or DTCs not supported by controller
or a communication error occurred

-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: 09D-927-750.lbl
Part No: 09D 927 750 K
Component: AL 600 6Q 0564
Coding: 0004153
Shop #: WSC 25649 444 57472
VCID: 36632C2F42D58491857-5124

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 7L0-907-379-MK25.lbl
Part No: 7L0 907 379 B
Component: ESP ALLRAD MK25 0106
Coding: 0014593
Shop #: WSC 25649 444 01420
VCID: 387F221748C172E197B-5124

1 Fault Found:
00778 - Steering Angle Sensor (G85)
000 - -

-------------------------------------------------------------------------------
Address 05: Acc/Start Auth. Labels: 3D0-909-13x-05.lbl
Part No SW: 3D0 909 135 K HW: 5WK 470 25
Component: Kessy 6400
Coding: 0000232
Shop #: WSC 31414 000 00000
VCID: 2D510343B783C749F4D-5124

Subsystem 1 - Part No: XXXXXXXXXXX
Component: ELV XXXX

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: 7L6-907-040.clb
Part No: 7L6 907 040 D
Component: CLIMAtronic R/L X 2714
Coding: 0000020
Shop #: WSC 25649 444 57472
VCID: 31691F33ABBBA3A9D05-5124

1 Fault Found:
01592 - Air Quality Sensor (G238)
014 - Defective

-------------------------------------------------------------------------------
Address 09: Cent. Elect. Labels: 7Lx-937-049-V1.clb
Part No: 7L6 937 049 K
Component: 2702
Coding: 0105694
Shop #: WSC 31414 000 00000
VCID: 448746E7040926010B3-5124

2 Faults Found:
00907 - Intervention load Management
000 - -
02195 - Dimmer Switch Instrument Panel & Switch Lighting (E20)
008 - Implausible Signal

-------------------------------------------------------------------------------
Address 15: Airbags Labels: 3D0-909-601.lbl
Part No: 3D0 909 601 B
Component: 0C Airbag 8.4E+ H07 0642
Coding: 0012355
Shop #: WSC 00000 000 00000
VCID: 224BE07FFE5D083159F-5124

No Faults Found
or DTCs not supported by controller
or a communication error occurred

-------------------------------------------------------------------------------
Address 16: Steering wheel Labels: 7L6-953-549.lbl
Part No: 7L6 953 549 B
Component: Lenks‰ulenmodul 3201
Coding: 0000031
Shop #: WSC 31414 000 00000
VCID: 3E73340F6AE54CD15D7-5124

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 7L6-920-xxx-7LA.lbl
Part No: 7L6 920 980 MX
Component: KOMBIINSTRUMENT RB0 2935
Coding: 0005231
Shop #: WSC 00000 000 00000
VCID: 1A3BD89FD60D40F181F-5124

2 Faults Found:
00470 - Company Comfort Databus in Single Wire
011 - Open Circuit
01304 - Radio
004 - No Signal/Communication

-------------------------------------------------------------------------------
Address 19: CAN Gateway Labels: 6N0-909-901-19.lbl
Part No: 6N0 909 901
Component: Gateway K<>CAN 0101
Coding: 0000006
Shop #: WSC 00000 000 00000
VCID: 70EFDA376031EAA19FB-5142

2 Faults Found:
00470 - Company Comfort Databus in Single Wire
011 - Open Circuit
01304 - Radio
004 - No Signal/Communication

-------------------------------------------------------------------------------
Address 1C: Position Sensing Labels: 7L6-919-879.lbl
Part No: 7L6 919 879
Component: JCI PathPoint 1600
Shop #: WSC 00000 000 00000
VCID: 040786E74489E6014B3-5124

No fault code found.

-------------------------------------------------------------------------------
Address 22: AWD Labels: None
Part No: 0AD 927 755 AB
Component: TRANSFERCASE 0094
Shop #: WSC 00000 000 00000
VCID: 7BF5FD1B397799F93A9-5124

1 Fault Found:
00532 - Supply Voltage B+
002 - Lower Limit Exceeded - Intermittent

-------------------------------------------------------------------------------
Address 34: Level Control Labels: 7Lx-907-553-34.clb
Part No: 7L6 907 553 B
Component: LUFTFDR.-CDC- 3C1P1 3650
Coding: 0015520
Shop #: WSC 25642 444 83584
VCID: 387F221748C172E197B-5142

2 Faults Found:
01575 - Control Switched Off
000 - -
00778 - Steering Angle Sensor (G85)
004 - No Signal/Communication

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr Labels: None
Part No: 7L0 959 760
Component: Sitzverstellung 0202
Shop #: WSC 00000 000 00000
VCID: 77FDE12B055FBD995E1-5124

No fault code found.

-------------------------------------------------------------------------------
Address 39: Right Light Labels: 3D0-909-158.lbl
Part No: 3D0 909 158
Component: EVG GDL+AutoLWR(r) X012
Coding: 0000003
Shop #: WSC 31414 000 00000
VCID: 67DDB16B55FF2D19CE1-5106

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv. Labels: 7L0-959-933.lbl
Part No: 7L0 959 933 F
Component: 33 HSG 0300
Coding: 0000081
Shop #: WSC 25649 444 54560
VCID: 3F8D490B6DEF45D9561-4AE8

Subsystem 1 - Part No: 7L0 959 701 A
Component: Tuersteuergeraet FS 0104

Subsystem 2 - Part No: 7L0 959 702 A
Component: Tuersteuergeraet BF 0104

Subsystem 3 - Part No: 7L0 959 703
Component: Tuersteuergeraet HL 0104

Subsystem 4 - Part No: 7L0 959 704
Component: Tuersteuergeraet HR 0104

1 Fault Found:
00470 - Company Comfort Databus in Single Wire
011 - Open Circuit

-------------------------------------------------------------------------------
Address 68: Wiper Electr. Labels: 7L0-955-119-V1.clb
Part No: 7L0 955 119 F
Component: Front Wiper 2416
Coding: 0000004
Shop #: WSC 31414 000 376832
VCID: 377D212B45DF7D999E1-5124

No fault code found.

-------------------------------------------------------------------------------
Address 6E: Ctrl Head Roof Labels: 7L6-919-044.lbl
Part No: 7L6 919 044 C
Component: DACHDISPLAY 0529
Revision: 00000529 Serial number: 2009289.01
Shop #: WSC 00000 000 00000
VCID: 377D212B45DF7D999E1-5124

No fault code found.

End-------------------------(Elapsed Time: 10:11)--------------------------

 

I just cleared it and scanned it again, here is what came from VCDS:

Tuesday,27,January,2015,16:40:41:37625
VCDS -- Windows Based VAG/VAS Emulator
VCDS Version: 14.10.0.0
Data version: 20141022


VIN: WVGBC67L94D003797 License Plate: JAN 27 2015
Mileage: 12060km-7493mi Repair Order:



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 7L (7L - VW Touareg (2003 > 11/2006))
Scan: 01 02 03 05 06 08 09 11 13 15 16 17 18 19 1C 22 29 32 34 36
37 39 3C 46 47 55 56 57 64 65 68 69 6C 6D 6E 75 76 77

VIN: WVGBC67L94D003797 Mileage: 12060km-7493miles
-------------------------------------------------------------------------------
Address 01: Engine Labels: 022-906-032-BMX.lbl
Part No SW: 022 906 032 BF HW:
Component: MOTRONIC ME7.1.1G 0005
Coding: 0001133
Shop #: WSC 31414 000 00000
VCID: 50AF7AB7C071CAA1BFB-5124

No fault code found.
Readiness: 0110 1101

-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: 09D-927-750.lbl
Part No: 09D 927 750 K
Component: AL 600 6Q 0564
Coding: 0004153
Shop #: WSC 25649 444 57472
VCID: 36632C2F42D58491857-5142

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 7L0-907-379-MK25.lbl
Part No: 7L0 907 379 B
Component: ESP ALLRAD MK25 0106
Coding: 0014593
Shop #: WSC 25649 444 01420
VCID: 387F221748C172E197B-5142

1 Fault Found:
00778 - Steering Angle Sensor (G85)
000 - -

-------------------------------------------------------------------------------
Address 05: Acc/Start Auth. Labels: 3D0-909-13x-05.lbl
Part No SW: 3D0 909 135 K HW: 5WK 470 25
Component: Kessy 6400
Coding: 0000232
Shop #: WSC 31414 000 00000
VCID: 2D510343B783C749F4D-5124

Subsystem 1 - Part No: 4E0 905 852 C
Component: ELV 1734

2 Faults Found:
01049 - Supply Voltage Term 50
009 - Open or Short to Ground - Intermittent
00189 - Control Circuit 2; Relay for Supply Voltage Terminal 50
011 - Open Circuit - Intermittent

-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: 7L6-907-040.clb
Part No: 7L6 907 040 D
Component: CLIMAtronic R/L X 2714
Coding: 0000020
Shop #: WSC 25649 444 57472
VCID: 31691F33ABBBA3A9D05-5142

1 Fault Found:
01592 - Air Quality Sensor (G238)
014 - Defective

-------------------------------------------------------------------------------
Address 09: Cent. Elect. Labels: 7Lx-937-049-V1.clb
Part No: 7L6 937 049 K
Component: 2702
Coding: 0105694
Shop #: WSC 31414 000 00000
VCID: 448746E7040926010B3-5124

2 Faults Found:
00907 - Intervention load Management
000 - -
02195 - Dimmer Switch Instrument Panel & Switch Lighting (E20)
008 - Implausible Signal

-------------------------------------------------------------------------------
Address 15: Airbags Labels: 3D0-909-601.lbl
Part No: 3D0 909 601 B
Component: 0C Airbag 8.4E+ H07 0642
Coding: 0012355
Shop #: WSC 00000 000 00000
VCID: 224BE07FFE5D083159F-5142

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel Labels: 7L6-953-549.lbl
Part No: 7L6 953 549 B
Component: Lenks‰ulenmodul 3201
Coding: 0000031
Shop #: WSC 31414 000 00000
VCID: 3E73340F6AE54CD15D7-5142

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 7L6-920-xxx-7LA.lbl
Part No: 7L6 920 980 MX
Component: KOMBIINSTRUMENT RB0 2935
Coding: 0005231
Shop #: WSC 00000 000 00000
VCID: 1A3BD89FD60D40F181F-5124

4 Faults Found:
00771 - Fuel Level Sensor (G)
010 - Open or Short to Plus - Intermittent
00438 - Fuel Supply Sensor 2 (G169)
010 - Open or Short to Plus - Intermittent
00470 - Company Comfort Databus in Single Wire
011 - Open Circuit
01304 - Radio
004 - No Signal/Communication

-------------------------------------------------------------------------------
Address 19: CAN Gateway Labels: 6N0-909-901-19.lbl
Part No: 6N0 909 901
Component: Gateway K<>CAN 0101
Coding: 0000006
Shop #: WSC 00000 000 00000
VCID: 70EFDA376031EAA19FB-5124

2 Faults Found:
00470 - Company Comfort Databus in Single Wire
011 - Open Circuit
01304 - Radio
004 - No Signal/Communication

-------------------------------------------------------------------------------
Address 1C: Position Sensing Labels: 7L6-919-879.lbl
Part No: 7L6 919 879
Component: JCI PathPoint 1600
Shop #: WSC 00000 000 00000
VCID: 040786E74489E6014B3-5142

No fault code found.

-------------------------------------------------------------------------------
Address 22: AWD Labels: None
Part No: 0AD 927 755 AB
Component: TRANSFERCASE 0094
Shop #: WSC 00000 000 00000
VCID: 7BF5FD1B397799F93A9-5142

No fault code found.

-------------------------------------------------------------------------------
Address 34: Level Control Labels: 7Lx-907-553-34.clb
Part No: 7L6 907 553 B
Component: LUFTFDR.-CDC- 3C1P1 3650
Coding: 0015520
Shop #: WSC 25642 444 83584
VCID: 387F221748C172E197B-5142

2 Faults Found:
01575 - Control Switched Off
000 - -
00778 - Steering Angle Sensor (G85)
004 - No Signal/Communication

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr Labels: None
Part No: 7L0 959 760
Component: Sitzverstellung 0202
Shop #: WSC 00000 000 00000
VCID: 77FDE12B055FBD995E1-5124

1 Fault Found:
00668 - Supply Voltage Terminal 30
002 - Lower Limit Exceeded - Intermittent

-------------------------------------------------------------------------------
Address 39: Right Light Labels: 3D0-909-158.lbl
Part No: 3D0 909 158
Component: EVG GDL+AutoLWR(r) X012
Coding: 0000003
Shop #: WSC 31414 000 00000
VCID: 67DDB16B55FF2D19CE1-5124

1 Fault Found:
00492 - Body Pitch Angle from Level Control Module
008 - Implausible Signal - Intermittent

-------------------------------------------------------------------------------
Address 46: Central Conv. Labels: 7L0-959-933.lbl
Part No: 7L0 959 933 F
Component: 33 HSG 0300
Coding: 0000081
Shop #: WSC 25649 444 54560
VCID: 3F8D490B6DEF45D9561-4AE8

Subsystem 1 - Part No: 7L0 959 701 A
Component: Tuersteuergeraet FS 0104

Subsystem 2 - Part No: 7L0 959 702 A
Component: Tuersteuergeraet BF 0104

Subsystem 3 - Part No: 7L0 959 703
Component: Tuersteuergeraet HL 0104

Subsystem 4 - Part No: 7L0 959 704
Component: Tuersteuergeraet HR 0104

2 Faults Found:
00470 - Company Comfort Databus in Single Wire
011 - Open Circuit
00928 - Locking Module for Central Locking; Front Driver Side (F220)
008 - Implausible Signal

-------------------------------------------------------------------------------
Address 68: Wiper Electr. Labels: 7L0-955-119-V1.clb
Part No: 7L0 955 119 F
Component: Front Wiper 2416
Coding: 0000004
Shop #: WSC 31414 000 376832
VCID: 377D212B45DF7D999E1-5142

No fault code found.

-------------------------------------------------------------------------------
Address 6E: Ctrl Head Roof Labels: 7L6-919-044.lbl
Part No: 7L6 919 044 C
Component: DACHDISPLAY 0529
Revision: 00000529 Serial number: 2009289.01
Shop #: WSC 00000 000 00000
VCID: 377D212B45DF7D999E1-5124

1 Fault Found:
02607 - Control Module (Relay?) for Aux. Water Heater (J737)
004 - No Signal/Communication

End-------------------------(Elapsed Time: 09:52)--------------------------

 

So, I can make both fuel pumps run when I use a jumper wire for each of the relays. Still no gas at fuel rail, and one of the pumps sounds like its bubbling.

Is there a third fuel pump or regulator between the fuel tank pumps and the fuel rail?

 

Have you hooked up a gauge to the schrader valve at the front of the fuel rail? ie. Actron fuel pressure gauge.

If you have air getting in the lines then you will have no pressure. It could also be dodgy pumps.

Remember you can't compress fluid so it's easy to pressurize a system with fuel.
However gas(air) can be compressed so if their is air in the line it will be hard to get the fuel up to a working pressure.

There is a high pressure pump within the engine itself.

You should download VW Self Study Guide on the VR6 motor. The fuel system is described on page 34/35/37 of the PDF.

 

Yes, I ran both pumps for a long time by using a jumper wire to bypass their relays. Still, only a little puff or air comes out, no enough to read on the fuel pressure gauge I had connected to the shredder valve at the fuel rail. The gauge on the dash is saying that I have one half tank of gas. I pulled both fuel pumps, and the hoses all look connected. Maybe there is a split in one of them, I did't look that closely.

I'll google for that VW Self Study Guide on the VR6 motor. Thanks for pointing that out.

Remember i just replaced both fuel pumps and fuel filter about 500 miles ago (about a month before this issue).

I also ordered second replacement Crankshaft position sensor today (should get here monday). I just replaced it be cause that could still be the issue, right?

My buddy told me the camshaft and crankshaft sensors on his chevy looked IDENTICAL, and he had to return them and buy another because someone might have switched what box each was in, that was the only way to identify them. After he did that, the truck started and problem solved. By looking at photos of the Touareg crankshaft sensors, it is possible I received one for another year or engine size.

 

Yes, I ran both pumps for a long time by using a jumper wire to bypass their relays. Still, only a little puff or air comes out, no enough to read on the fuel pressure gauge I had connected to the shredder valve at the fuel rail. The gauge on the dash is saying that I have one half tank of gas. I pulled both fuel pumps, and the hoses all look connected. Maybe there is a split in one of them, I did't look that closely.

I'll google for that VW Self Study Guide on the VR6 motor. Thanks for pointing that out.

Remember i just replaced both fuel pumps and fuel filter about 500 miles ago (about a month before this issue).

I also ordered second replacement Crankshaft position sensor today (should get here monday). I just replaced it be cause that could still be the issue, right?

My buddy told me the camshaft and crankshaft sensors on his chevy looked IDENTICAL, and he had to return them and buy another because someone might have switched what box each was in, that was the only way to identify them. After he did that, the truck started and problem solved. By looking at photos of the Touareg crankshaft sensors, it is possible I received one for another year or engine size.

The self study guide will indicate that the car will start if only the crankshaft sensor operates. Guide indicates the ECU will use the crankshaft sensor as a default signal if both camshaft sensors fail. When my intake sensor went bad car would not start. You are correct a faulty crankshaft sensor will cause a no start .

Based on the scan I would replace the supply voltage terminal 50 relay in the E-box . It is right next to the fuel pump 404, square relay by the fuses . Should be c20. Not related to fuel but related to entry authorization. Keeping someone from stealing the car and immobilizing function have controls all tied to entry and authorization. Not certain if they shut off fuel or similar. Think it might be fuel since you have spark. Also had a fuel sensor error. Have no knowledge on the sensor, but it is possible when the system thinks there is an unauthorized entry fuel flow to the rail is nil and sensor detects no flow? Speculation on my part.

The 50 relay was open per scan. Think it should be closed. Suppose you could jump it and see?

 

Did you replace the pumps yourself?
The only reason I ask is because I replaced the fuel filter and either the O-ring in the filter assembly or fitting all the quick connects back together introduced an air leak. I took it all apart and put it back together again (with more care) and it fixed it.

Did you smear some petroleum jelly / vasoline over the quick connect fittings when you reassembled the pumps? Who knows, maybe you rolled or damaged an o-ring? Maybe one of the fuel line quick connects is hooked up to the wrong mating fitting....I don't know? Maybe it's time to pull it all apart and check the quick connect fittings with a torch to see if any o-rings are damaged.

Please let me know how you go replacing the cam sensor as I am trying to improve cranking time. Would you be so kind as to post photos of how this is done? Thanks very much.

Cheers, Ben.

 

I'm working on it right now. Please chime in if you have any other advice.

I just found this:

http://www.waynet.com.cn/r36.pdf


Excellent resource.

 

Just a suggestion. A summary of events might help everyone understand your Touareg's issues to date.

Can you please list out the sequence of repairs that have been done on the vehicle prior to this issue?
ie.
1 - Replace fuel pumps . Who : Mechanic . When : 2 weeks ago
2 - Checked relay xx. Who : Me . When : yesterday

Try to write a list of YES/NO items some you can check things off as you complete them. This will try to keep you sane and also help others understand what your up to.

So if the pumps were replaced do you know if the flanges have as well? That's the tank "cap" with the filter on it (LHS) and the regulator (RHS) ?

Maybe the filter has not been changed and it is blocked or some "gunk" from the pump line has lodged itself in the filter.

You could try washing out the filter with petrol/gasoline and re-installing .

Please don't take this the wrong way. It's only a suggestions.

Good luck!!

 

I just made better jumper wires and forced both low pressure fuel pumps to run.

I rented a fuel system diagnostic kit from AutoZone. I connected to the low pressure fuel line under the hood. (connection located at top edge of fire wall in center of engine bay).

I used the bleed valve on fuel pressure gauge to purge any air in the system. I let it run for about 45 seconds to a minute. I verified that both fuel pumps were running the whole time. I released the bleed valve to allow pressure to build, even though at no time did any fuel come from the bleed valve. Never did any fuel reach the low pressure fuel line, at the coupler just before the high pressure fuel pump located in the engine head (nor my diagnostic fuel gauge).

So, that would mean no fuel is being delivered to the high pressure fuel pump, right?

 

I just made better jumper wires and forced both low pressure fuel pumps to run.

I rented a fuel system diagnostic kit from AutoZone. I connected to the low pressure fuel line under the hood. (connection located at top edge of fire wall in center of engine bay).

I used the bleed valve on fuel pressure gauge to purge any air in the system. I let it run for about 45 seconds to a minute. I verified that both fuel pumps were running the whole time. I released the bleed valve to allow pressure to build, even though at no time did any fuel come from the bleed valve. Never did any fuel reach the low pressure fuel line (just before the high pressure fuel pump located in the engine head).

So, that would mean no fuel is being delivered to the high pressure fuel pump, right?

That would be my opinion. Find it hard to believe both pumps are faulty. You should get fuel to the high pressure pump. Perhaps the pressure regulator assembly flange above the passenger pump is faulty. Could have some blockage in the filter but does not seem likely. Pretty hard to connect the lines wrong. Can't have a leak or you would know/smell. The pumps when powered will hum, but still might not properly suction fuel so noise is not necessarily proper operation.

I am not aware of any function that prevents fuel flow from operating pumps to reach HP pump. Pretty certain a bad pressure regulator can keep pressure from achieving 2 bar. Think low pressure system's operating pressure has to be between 2and 5 bar.

You could pull one of the pumps, get a mop bucket set the pump in the bucket, put about 3 inches of water in the bucket, let lines hang down, attach a battery source to the connector and you should get flow from two lines or one can't recall. You can use an RC car battery. If you feel comfortable putting fuel in the bucket won't have to let pump dry before reinstalling. Have to be careful, no sparks from battery source. I just use very long leads and never stand over bucket. A fully charged RC battery should produce good flow. No flow, bad pump. Would do drivers pump first however you could just have a pressure issue.

I would replace the pressure assembly valve on the assumption pumps are OK. Would also make sure tiny electrical connector to fuel filter flange and pressure flange(inside tank) are connected to correct terminals.

 

I just had both low pressure fuel pumps replaced by a mechanic about 500 miles (only one fuel fill-up) ago.

What could be the issue here?

 

Thanks for jumping in G6,

Is is possible that I could have a leak in a hose within the fuel tank?

I'll check connection under driver side (USA) fuel pump flange.
I might try the RC battery (my 1/18 scale rc uses 7.? volts, my drill battery uses 18 v), but I paid a mechanic (one of the only two times in my life) to replace both fuel pumps in the tank, so I might have it towed back to him.

Like you said: Perhaps the pressure regulator assembly flange above the passenger pump is faulty.

How would I know if the pressure regular assembly flange is bad?

 

I'll check hose connections within fuel tank again tomorrow.

And yes, I would certainly notice a drip of fuel in the bin or under the vehicle.

 

If you can hear the pumps buzzing and no fuel is coming out of the bleeder valve on the fuel pressure gauge, then no fuel is going to the high pressure pump.

I think you need to have the two fuel pumps, particularly the pipe connections between the two looked at again. Maybe the pipes came loose.

 

I think you are right. I'll check the hose connections within the fuel tank tomorrow

(and I will likely bring the Touareg back to the mechanic (who installed the fuel pumps), if we can't solve this issue in the next two days.

 

No Problem benb2376,

I did the work unless otherwise noted.

Summary of events:

• 
  I replaced all spark plugs and coils about six months ago.

• Checked air filter about 500 miles ago.(it was clean).

• After about 1,500 miles of driving (about 500 miles ago), engine performance was operationg perfectly. I refueled (with premium octane) from 3/16th's to full tank of gas. The touareg would start, but only run for 30 seconds, then die. I had to leave the touareg at the gas pump and get a tow truck the next day. I had it towed to my local euro mechanic.

• We decided to replace both fuel pumps and their seals.

• I drove the touareg, it was working perfectly after the new fuel pumps (for about 500 miles).

• when fuel was low, I refueled again with Premium octane like always. The current issue surfaced when it got to about 3/8th's of a tank.

• I drove to work, at night, in perfect weather (about 70ºF, clear skies) to check on something. When I arrived at the work site, I park (with engine running) get out and open rear glass to get my keys to open the gate. I open the rear glass and a few seconds later, while I'm fishing around in the back, The engine dies. Radio and lights stay on, just like clicking the key from running to the "on" position, but I didn't touch anything. The touareg would crank forever and not start after that. A buddy came to help out, and we put more gas in it, and after no start, we towed it about 300 feet to under an awning of the worksite and it has been there undercover ever since. That was about 5 or 6 weeks ago.

• Since then, I have kept battery on float charger, and I have replaced the crankshaft sensor twice, just for good measure.

• Now we know it is not getting gas to the High pressure fuel pump for some unknown reason.

 

tharlan,
I may be off base with this suggestion but here goes anyway.

you have had a problem where no fuel is coming out the high pressure pumps and had them replaced.

After working for a while the problem has reoccurred.

You are now looking at connections to the pump, and within the tank itself as well as for split piping.

Just a thought that maybe there is something restricting the fuel flow that builds up over a bit of time. Perhaps the pipes are blocking?

Seems to me that perhaps there could be some grunge or grit in the tank that gums up the fuel flow, and that it took a bit of time to restrict the aperture after you replaced pumps to cause the problem to reoccur.

Maybe you need to consider an empty and thorough clean of the tank and replacement with fresh known good fuel. if fuel is dirty then perhaps the fuel lines themselves need to be looked at.

We don't get the cold weather here that you get, and hence don't generally have winter fuel to worry about (37.8 C here at the moment - near enough to 100F) but as I understand it that perhaps may have contributed to your problem with poor fuel for the temps you are in.

May well be off base, but if going into the tank have a look at the fuel quality perhaps while you are there (signs of dirt etc).

Hope you get this sorted soon, and hope y comments aren't too off base
Cheers

 

I'm going to check all the hose connections after lunch, Thank G6. Good advice.

I'm posting some of the pages that I found interesting (as attachments, I couldn't figure out how to insert as PDF's):

 

Also, This video that is for a V8 engine.

www.youtube.com/watch?v=ZVBaH2jsPg4

 

SO, I connected a clear flexible hose to one port at a time on top of the Passenger side fuel pump flange and jumped the relay to make it run, but nothing came out. it was gurgling, and it's little motor was running, but no fuel left the flange.

I called my mechanic, who replaced the pumps about 500 miles ago and I will be taking it to him, as it's possible he might fix it for free or for very little if it had something to do with his work.

 

SO, I connected a clear flexible hose to one port at a time on top of the Passenger side fuel pump flange and jumped the relay to make it run, but nothing came out. it was gurgling, and it's little motor was running, but no fuel left the flange.

I called my mechanic, who replaced the pumps about 500 miles ago and I will be taking it to him, as it's possible he might fix it for free or for very little if it had something to do with his work.

Have him replace with VDO pumps, both sides. Does not matter if Porsche cayenne or VW same pump. Both of mine said cayenne on the box. I would spend the money and put in new assembly flanges for the filter and pressure regulator. Think your previous post indicated only the seals were replaced?

Looks like correcting this will resolve your problems.

 

G6,

That was perfect advice, and perfect timing!

Sorry, I've been gone so long from the forum, just busy.
I read your last post just as the tow truck was pulling into my mechanic's shop. I asked him to check the regulator in the flange on the passenger side USA.

He did use the correct VDO pumps on both sides. It turns out the techs that worked on it, "may or may not have" connected one of the hoses deep inside the fuel tank. (must not have pushed the quick connect on all the way). Mechanic said he wrapped wire around it this time to keep it on. That docent sound great, I hope he used stainless or aluminum. It runs fine now.

 

G6,

That was perfect advice, and perfect timing!

Sorry, I've been gone so long from the forum, just busy.
I read your last post just as the tow truck was pulling into my mechanic's shop. I asked him to check the regulator in the flange on the passenger side USA.

He did use the correct VDO pumps on both sides. It turns out the techs that worked on it, "may or may not have" connected one of the hoses deep inside the fuel tank. (must not have pushed the quick connect on all the way). Mechanic said he wrapped wire around it this time to keep it on. That docent sound great, I hope he used stainless or aluminum. It runs fine now.

Glad you got it squared away. I had similar frustrations working on my car and after awhile your patience wears thin.

I was just wondering about you this morning. Figured no news was good news. Always good to hear the outcome/ resolution.

 

The tow was $85, and I swapped out the crankshaft position sensor twice, so I spent about $300.

I now have two extra, perfectly good crank shaft position sensors, one was used, the other was not.

I'm planning to sell the Touareg. I'll try to post it in the Classifieds in the coming weeks. I have "for sale" signs in it now.

 

The tow was $85, and I swapped out the crankshaft position sensor twice, so I spent about $300.

I now have two extra, perfectly good crank shaft position sensors, one was used, the other was not.

I'm planning to sell the Touareg. I'll try to post it in the Classifieds in the coming weeks. I have "for sale" signs in it now.

Mine is paid for and plan on driving until it blows up or repair costs get outrageous. Not going to get enough for a ten year old car to make it worth while if i sell. Have been looking at the Porsche Macan, but not ready to commit to $70k. Baseline is $50k Nice car though, a little smaller than the touareg, same chasis as the Audi Q5. Would have to sell my GTI and wife's Tiguan which would not go over very well.