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Discussion Starter #1
Hi.
So I have a problem with 1.9tdi pd engine passat, engine code AVB. Help is really appreciated if anyone knows what can be wrong before changing tandem pump or injector seals to find out problem is somewhere else.
Problem: Starts fine if shut down from key. Idles fine for about 10mins after start and then starts to shake and injection quantity deviation is maxed out at 2.99. No fault codes. Looks like the car is running out of fuel and when fuel return line from tandem pump is clamped idling goes normal again. Clamp out and car dies. No smoke from exhaust when running and only does this after 10minutes idling or driving. Engine runs fine when pressing throttle but doesn't stay at idle after the problem starts.
Glow plug light comes on for few seconds when ignition on and lift pump pumps fuel too.
After stalling motor is unable to start until next day, except one time it started while cranking with clamped return line.
Thanks for the help.
 

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The tandem pump has a fuel pressure regulator that fails. Look it up and see how to replace it.
Something like this is what I'm finding


One for a 2013, not sure about you're specifically
 

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The tandem pump has a fuel pressure regulator that fails. Look it up and see how to replace it.
Something like this is what I'm finding


One for a 2013, not sure about you're specifically
His is a PD and not a CR. Would really need to scan it with VCDS to know what is going on
 

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Discussion Starter #4
Scan with vcds done a few times but no faults stored. Measure group 013 shows that injector deviation goes 2.99mg/str in 2 cylinders and 2 at -2.99mg/str when problem starts, first ten minutes of running these values are nicely within spec at less than +-0.5mg/str.
Theres a fuel return valve on tandem pump which should keep pressure at 14-15psi so obviously its not working or pressure is leaking somewhere else because when return line is pressed together engine starts to run normally almost instantly.
 

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Theres a fuel return valve on tandem pump which should keep pressure at 14-15psi so obviously its not working or pressure is leaking somewhere else because when return line is pressed together engine starts to run normally almost instantly.
I think you should put a new one in. Not sure if it's the one I posted before, I just searched for the engine and pressure regulator. Fuel return valve as you call it is what I read talking about in the first place and searching have me the results I found before.

Do you know what the one you have looks like? Is it like this Genuine VW/Audi VW-06D130757C Fuel Pressure Regulator; Inline Restrictor SKU: 1433187-VW-06D130757C - Audi, VW | 06D130757C

This is a decent little video on a 2004 Jetta, different car but a PD. Test should be similar. I lean towards the return valve either way, however, it could be two fold.

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Discussion Starter #7
I think you should put a new one in. Not sure if it's the one I posted before, I just searched for the engine and pressure regulator. Fuel return valve as you call it is what I read talking about in the first place and searching have me the results I found before.

Do you know what the one you have looks like? Is it like this Genuine VW/Audi VW-06D130757C Fuel Pressure Regulator; Inline Restrictor SKU: 1433187-VW-06D130757C - Audi, VW | 06D130757C

This is a decent little video on a 2004 Jetta, different car but a PD. Test should be similar. I lean towards the return valve either way, however, it could be two fold.

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Im talking about this valve which is built in tandem pump as shown in this picture.
8472
 

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First posts normally go in introductions else you could get a free fix and we never see you again!!!

Forum Rules and Guidelines


This is a new forum layout which is owned by a company 6 months ago that doesn't give a dam with loads of bugs which have been reported in the new thread. There is no TDI Wiki at the moment or original similes. It doesn't show the car spec/location.

We Are Live - Community Feedback

This has been talked about many times.

I've made a poll which no one has posted in, there are a few votes and comments.

Do you like the new forum features?

Wiki pages have been restored as of 7th December, I asked where is the link it should be on top of the main forum.

You need to get your motor scanned (preferably with VAG-COM\VCDS) for any error codes logged in the ecu and post them, that will save a lot of guessing and check systems out.
 

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So the rebuild kits I've seen should have two springs for the inlet and return valves. Those springs wear and fail causing the valve to let to much fuel through. I haven't been able to find a valve, so I assume that you simply need to rebuild it, or replace the pump. Rebuild is much cheaper. I think the pressure test could be effected by the springs being worn and not holding pressure giving a false reading of the lift pump.
Also I ordered a URO lift pump from fcp euro I think it was, for around $100...

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