Question about 1995 Buick Park Avenue

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Power to fuel pump relay

I made a donation last time and got an answer which was no help at all. My '95 Park Ave breaks down randomly, every time this happens I lose power to the windows too. I changed engine ground from battery, no good.
I discovered I have poor voltage going to fuel pump relay inside car on passenger side, I can't source where bad power supply comes from as I can't find a wiring diagram. I also found the window relay right next to the pump relay so I guess it is starting to make sense. Does anyone know where the power supply comes from which goes to fuel pump relay inside car on passenger side wall below dash. My light tester says the power is very weak to pump relay so I believe I can solve this if I can find where the bad feed is coming from.
Any help or someone with experience in this area would be much appreciated as I've been going round in circles getting nowhere for some time now :-(

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Wade sorry to hear your woes, when I have this kind of trouble I virtually start from the beginning. What I would do in your case, is go directly to the fuel pump test the connections on the pump, they may have deteriorated, I wwould discard the existing wires and feed 2 new ones, {one to earth and one to power} Find out if your ignition supplies earth or power when you turn the key before creating a nearby ground. Run the new wire to the relay, this way you eliminate any possible breakdown from the relay to the pump. If this fails it was a small expense. Be sure that the pump is producing the right pressure when it gets hot the seals may not offer the poundage it needs to continue. A pressure test can be done at a mechanic shop with the right tool.
In summary, power from ignition to fuse, to relay, to pump. Finally, this does sound like an earth problem. Battery earth to body and another to engine should be existing too. Good luck, hope this helps.

Posted on Nov 19, 2009

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If you are getting weak power inside the car It is between that and the battery. Have you checked the fuel pump relay under the hood? I had this problem with My 96 Cutlass Ciera and it would stall randomly. It is the relay to the left of the radiator looking into the hood. There are I think 5 In a line and the fuel pump relay is the one all the way to the right.(Looking into the engine compartment)

Posted on Nov 29, 2009


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