Fuel pump packed in (lots of noise, loss of pressure/delivery) then ominously quiet as the car coasted to the hard shoulder...
Main dealer replaced fuel pump today, but the car refused to fire up. They say that they don't have enough experience of these old cars (!) and have recommended I take it to a fuel injection specialist. Is it likely to be anything simple that I can check? Air in the system? Needs bled? It now has a flat battery thanks to the dealership. Overall not a good day. Any suggestions would be most welcome.
Thanks.
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Sounds like air in system.
Needs to be bled.
Undo injectors one at a time (loosen only ) , wrap cloth round it to catch petrol and switch on ignition. Very careful .. need a second watcher as you could spray petrol all over engine .. etc.. Manual may have recommendation (see libarary if you have not got one).
madf
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I assume your car has Bosch KE-Jetronic?
Is the pump actually running?
Bridge out the fuel pump feed at the fuel pump relay - the pump should now run continuously and fuel will circulate down the fuel line and back to the tank via the return line.
Take off air cleaner and gently push on air flap (circular brass disc) - this will allow some fuel to be injected into the cylinders. Now try starting.
These systems don't generally need to be bled - they are self-bleeding.
My only concern is that your old pump may have broken up and there is debris in the system.
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Thanks, It is a Bosch system. Will try all your suggestions tomorrow when I tow it back here tomorrow.
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Sorry - can't actually help you with the problem. However, I'm absolutely astonished that a main dealer's advice is to take it somewhere else. I'd have flipped my wig. Sure the car's old, but it's still an Audi. If an Audi dealer can't fix it, I despair. I really do (and I don't even drive an Audi). Is it me?
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Alternative idea.
Have you got an air leak between the airbox and inlet manifold? On the K-Jetronic system the airflow meter is mounted on top of the airbox, and the system won't compensate for holes downstream of the airbox. The engine draws air through the hole rather than the airflow meter, and so the system doesn't feed in enough fuel.
Maybe the pipe between the airbox and manifold has split. They go brittle with age.
Don't ask me how I found this out last night!
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Thanks for the advice so far. Tries all the checks you have all suggested and have more info to report back. The pump is pressurising fine. The fuel is getting to the filter, out the other side and to the fuel distributor. From there it is pressurising what I think is the fuel system pressure release valve on the side of the engine, but there is no pressure in the fuel lines from the fuel distributor to the injectors. Is there a fuel cut off valve or relay controlling the fuel feed to/from the fuel distributor?
Thanks in anticipation.
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Try a Bosch dealer? There\'s a dealer locator at:
www.boschautoparts.co.uk
I used to have an Audi 100 2.0E, which gave me great service for ten years, especially after I switched servicing from VW/Audi main dealers to an independent VW/Audi specialist.
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