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Passat 1.9tdi pd AVB dies after 10min running and doesn't start. Runs when return line clamped.

14K views 13 replies 6 participants last post by  celtjon 
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
 
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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Here's a post on one


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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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There's a fuel pressure regulator you need to check. First check the fuel pressure to the rail at the tandem pump.


You should always start a new thread and link the thread you find with information related to yours. However, I'm not sure the above thread will help you much.


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