help. changed fuel filter. longer cranking time. - Club Touareg Forums
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post #1 of 20 Old 01-17-2015 Thread Starter
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help. changed fuel filter. longer cranking time.

Hi there.
I changed the fuel filter on my 3.2 v6 last night. Now it takes longer to start.
Any ideas?
Air in fuel line? How do i bleed this?
Thanks very much.
Ben.
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post #2 of 20 Old 01-18-2015
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Try charging your battery, just to rule it out.


I had changed the fuel filter in my 3.0 TDI and didn't do a thing other than take the old filter out and drop the new one in and the motor never missed a beat.
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post #3 of 20 Old 01-19-2015 Thread Starter
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Thanks
I tried charging the battery but it did not help

I am thinking an O-ring in one of the fuel line quick connects is letting in air and I am loosing fuel pressure.

Once driving it is fine. Just takes longer to start and fire up.

Has anyone else had trouble with the fuel line connections? Any advice?

Thanks.
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post #4 of 20 Old 01-21-2015
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Quote:
Originally Posted by benb2376 View Post
Thanks
I tried charging the battery but it did not help

I am thinking an O-ring in one of the fuel line quick connects is letting in air and I am loosing fuel pressure.

Once driving it is fine. Just takes longer to start and fire up.

Has anyone else had trouble with the fuel line connections? Any advice?

Thanks.
Seems like you have a slow priming issue. Once the car has started the other pump on drivers side provides low pressure fuel to the high pressure fuel pump on the block by the rail for the injectors .

I would open it back up and check all the connectors and wires. Sure you connected wires properly? Pull on the connectors to see they are locked down. They are push pull and need to make sure they are firmly connected. Would also check and make sure O ring below the flange is sitting properly and not pushed down into tank. If the O ring is seated properly the flange is easy to lock down and sits flush. Never have heard about bleeding air out of the system. Pump is a suction from the bottom so should not be any air in the line just fuel unless tank was very low or empty.
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post #5 of 20 Old 01-21-2015
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make sure the filter is installed correctly. Some of them have thermostats in them that will allow full flow in one direction but only minimal reverse flow. Installing in reverse starves the fuel supply.

Other than that, check the intank pump.

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post #6 of 20 Old 01-21-2015 Thread Starter
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Thanks for the suggestions. I pulled it all apart again and found the following :

1. Fuel Filter O-ring was incorrectly installed. It's very hard to install. I guess that's why they sell it as part of the fuel flange.
I used the new top half of the fuel flange as it fitted the o-ring a bit better.

2. Bottom outlet of fuel flange has been previously modified with a hose clamp, probably because they did not want to disconnect the hose on the other side of the tank. So I retightened it.

See picture below of what happened.

All good now!!
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post #7 of 20 Old 01-23-2015
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Quote:
Originally Posted by benb2376 View Post
Thanks for the suggestions. I pulled it all apart again and found the following :

1. Fuel Filter O-ring was incorrectly installed. It's very hard to install. I guess that's why they sell it as part of the fuel flange.
I used the new top half of the fuel flange as it fitted the o-ring a bit better.

2. Bottom outlet of fuel flange has been previously modified with a hose clamp, probably because they did not want to disconnect the hose on the other side of the tank. So I retightened it.

See picture below of what happened.

All good now!!
Glad to hear. I just bought a new filter flange assembly rather than replace the filter. Next time may just change the filter as it is less costly. Previous filter lasted ten years (it was filthy/black). Running the line to the other side is not a big deal, but have heard others just cut and hose clamp, but I did not trust using a hose clamp.
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post #8 of 20 Old 01-23-2015
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How do you know it is time to change the filter? Any symptom?
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post #9 of 20 Old 01-23-2015 Thread Starter
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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 😉
Cheers.
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post #10 of 20 Old 01-23-2015
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Driveability problem particularly normal at slower speeds but bogs on acceleration would be a typical symptom. It is interesting to learn starting could be another.

Looks like the filter should be considered a routine maintenance item. Thanks for the picture and detailed explanation.
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