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Not a valid test. Pump may be fine.
Posted by RayF (more from RayF) on Wed, 29 Oct 2008 14:14:07
In Reply to: 1990 900 fuel replacement, xavier, Wed, 29 Oct 2008 13:27:16
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Xavier, turning the key to ON will not make the fuel pump run. If you still have the line off the filter, try CRANKING the car very briefly, with car outdoors and something down there to catch what spills out. There's a risk of fire obviously so do this with great care, just a second of cranking, stick line into a can before cranking if you can. No smoking/no sparks.
Or you can crack the banjo bolt at front of the fuel rail, easier to get to than the one on the fuel filter if that's already tightened back down.
The fuel pump on these cars ONLY runs when the car is cranking or running. There is no pre-run at key-on, not even a brief pre-run.
There are ways to jumper things and make the pump run if it will. Do a search on here to find them. Jumpering between two fuses, as specified in Bentley, or triggering the fuel pump relay by grounding the purple wire from the ECU while the ignition is on.
If you do jumper to test the fuel pump, you don't really need to crack a line, you should be able to hear it while it's running if things are quiet - - a low rumbling-growling from out back, getting a little lower as pressure builds over about a second or two.
DO NOT open or install your new fuel pump until you know whether it's needed. You can't send it back if it's not the problem.
posted by 70.105.24...
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