help. changed fuel filter. longer cranking time. - Page 2 - Club Touareg Forums
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post #11 of 20 Old 01-25-2015
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Originally Posted by benb2376 View Post
Hi.

I just had timing chain done and was trying to improve "cranking time to start" as my other car starts straight away, plus i didn't know if it has been done before.

The only reason or symptoms from reading the forum is people trying to address driveability and starting issues.

VW say it's life long filter but when i pulled mine out it was covered in black oily substance. I'm glad I changed it and now i know it's been done.

Apologies for the long reply. I hope i haven't put you to sleep dde09
Cheers.
Did changing the filter improve cranking time? If not you might want to pull and clean the camshaft sensors and crank sensors and clear the crude off the magnets. Clean sensors can improve cranking time.
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post #12 of 20 Old 01-25-2015 Thread Starter
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Not really. Just back to what it was.
I might try that next.
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post #13 of 20 Old 01-25-2015
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Originally Posted by benb2376 View Post
Not really. Just back to what it was.
I might try that next.
The sensors are what help the car crank fast. They tell the ECU which piston is at TDC and fire it first. If either of the camshaft sensors go bad car will take much longer to crank. If both camshaft sensors go out the ECU will use the crankshaft sensor and it will take a very long time to crank. If the crankshaft sensor goes out the car will never start and die immediately if running.
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post #14 of 20 Old 03-05-2015
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With 100K on the egg, decided to clean the fuel filter. Two months ago I got home after a 2 hour drive at high speed, unpacked the car and when starting up, car would barely run. Turn off and restarted just fine. So with time on my hands, I wanted to check the system out. First of all I canít believe the fuel rack doesnít have a fuel tap. So with a homemade setup checked fuel pressure. Noted items:
1. Opening the driverís door, primer pump comes on for a short time. Fuel pressure 60 psi. Pressure is checked in. No pressure drop noted, so check valve appears to be working.
2. Start engine and pressure is around 62 psi. To determine if fuel filter is restricting flow, the gauge setup has a pressure release button. Pushing the button, fuel filled a 12 oz. bottle in no time. I figured thereís no way with the engine at full throttle it could use this amount of fuel. Pressure drop was around 3-4 psi.
On other threads, Iíve noted that fuel pressure should be around 55 psi. So do I have a problem here?
So with this known, jumped into filter removal. With filter removed, fuel filter with 100K. Used two cans of carburetor cleaner.
With everything installed, couldnít get any pressure and started asking myself what happened but with benb2376 postís ďlessons learnedĒ when installing the O-ring/cap I also rolled the O-ring off the seated position. So note: lubricate the O-ring and cap and when you get the cap seated hold firmly until you get a couple of screws installed. Due to the filter spring, item 10 on benb2376 attachment, the spring will want to move the cap thus dislodge the O-ring. So with everything back together, opened /closed driverís door. Thought I heard the pump but had no pressure. Closed door and went and got a drink, cause I needed one. Came back opened door and got 40 psi. before the pump shut off. Started engine and pressure went to 62 psi. Hit the pressure release button on the gauge and got a little air. With everything back together, I drove the car to work today.
Another thing I learned is when the engine is cold it runs at a higher RPM and drops when engine is warm. What is noted is that the fuel pressure stays the same. On past cars the fuel regulator would lower fuel pressure during warm up and return to a higher pressure after itís warmed up. So again do I have an issue with the regulator?

Anyway attached some pictures.

Attached Files
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File Type: pdf DSC02549.pdf (1.07 MB, 42 views)
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File Type: pdf DSC02552.pdf (1.08 MB, 56 views)
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post #15 of 20 Old 03-05-2015
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Originally Posted by ssicbx View Post
With 100K on the egg, decided to clean the fuel filter. Two months ago I got home after a 2 hour drive at high speed, unpacked the car and when starting up, car would barely run. Turn off and restarted just fine. So with time on my hands, I wanted to check the system out. First of all I can’t believe the fuel rack doesn’t have a fuel tap. So with a homemade setup checked fuel pressure. Noted items:
1. Opening the driver’s door, primer pump comes on for a short time. Fuel pressure 60 psi. Pressure is checked in. No pressure drop noted, so check valve appears to be working.
2. Start engine and pressure is around 62 psi. To determine if fuel filter is restricting flow, the gauge setup has a pressure release button. Pushing the button, fuel filled a 12 oz. bottle in no time. I figured there’s no way with the engine at full throttle it could use this amount of fuel. Pressure drop was around 3-4 psi.
On other threads, I’ve noted that fuel pressure should be around 55 psi. So do I have a problem here?
So with this known, jumped into filter removal. With filter removed, fuel filter with 100K. Used two cans of carburetor cleaner.
With everything installed, couldn’t get any pressure and started asking myself what happened but with benb2376 post’s “lessons learned” when installing the O-ring/cap I also rolled the O-ring off the seated position. So note: lubricate the O-ring and cap and when you get the cap seated hold firmly until you get a couple of screws installed. Due to the filter spring, item 10 on benb2376 attachment, the spring will want to move the cap thus dislodge the O-ring. So with everything back together, opened /closed driver’s door. Thought I heard the pump but had no pressure. Closed door and went and got a drink, cause I needed one. Came back opened door and got 40 psi. before the pump shut off. Started engine and pressure went to 62 psi. Hit the pressure release button on the gauge and got a little air. With everything back together, I drove the car to work today.
Another thing I learned is when the engine is cold it runs at a higher RPM and drops when engine is warm. What is noted is that the fuel pressure stays the same. On past cars the fuel regulator would lower fuel pressure during warm up and return to a higher pressure after it’s warmed up. So again do I have an issue with the regulator?
Anyway attached some pictures.
Flow from the pumps is only low pressure fuel to the high pressure pump on the block which increases fuel pressure to less than 1,750 psi going to the fuel rail for the injectors. Doubt you have an issue with the low pressure regulator above the passenger side pump. If car runs ok would not worry about it. Check the pressure again it probably is higher than the 40psi you recorded which may have been low due to air in the low pressure system.
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post #16 of 20 Old 03-05-2015 Thread Starter
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ssicbx

Great report and photos. Like G6 said it would be good to repeat.

Even if you repeat 3 or 4 times and get the average. Data is king!

Regards
Ben
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post #17 of 20 Old 03-06-2015
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G6, don't know about the 1,750 psi. You think the pump could make that kind of pressure? As to the 40 psi. this was with the inital start up, with air in the system. As to the amount of time the primer pump runs, I think this based on time instead of pressure.
Benb, where do you live in Australia? I used to work out of Perth. Long flight!
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post #18 of 20 Old 03-06-2015 Thread Starter
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Try Victoria.
Cheers.
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post #19 of 20 Old 03-06-2015
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Quote:
Originally Posted by ssicbx View Post
G6, don't know about the 1,750 psi. You think the pump could make that kind of pressure? As to the 40 psi. this was with the inital start up, with air in the system. As to the amount of time the primer pump runs, I think this based on time instead of pressure.
Benb, where do you live in Australia? I used to work out of Perth. Long flight!
Sorry. The pressure release valve for the high pressure pump will activate if rail pressure exceeds 1,740 psi. Yes the high pressure pump can produce that kind of pressure. Would have to for the injectors to Inject vaporized fuel into the combustion chamber. Should have 800cm fuel with 15 seconds of flow from low pressure pumps.
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post #20 of 20 Old 03-07-2015
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Quote:
Originally Posted by ssicbx View Post
G6, don't know about the 1,750 psi. You think the pump could make that kind of pressure? As to the 40 psi. this was with the inital start up, with air in the system. As to the amount of time the primer pump runs, I think this based on time instead of pressure.
Benb, where do you live in Australia? I used to work out of Perth. Long flight!
The high pressure fuel pump is piston driven and generally operates at 1,595 psi.
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