Question about 1996 Oldsmobile Cutlass Supreme Coupe

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New fuel pump 1996 olds cerria

Put new fuel pump in. the pump runs and stops in seconds car wont start. spray gas in throtle body car runs. my guy working on it is lost and so I"am I. I hope to get some help. It seems like their is no current staying at the pump

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  • walmartbill Apr 16, 2009

    my car ran fine until this happen. I guess I will try to see if I can find the prolbem

  • walmartbill Apr 16, 2009

    Hi, sorry to be a pain, I work nights and sometimes no sleep. I cant fine the fuel relay switch or relay, they say its on the firs wall I cant find it, can you help me with this. Thanks Bill

  • walmartbill Apr 20, 2009

    Hi, thanks for everything you told me. I guess my fault was taking it too a halfass mechanica, this guy doesnt waqnt to do **** he has had my car for two weeks. I took him the relay, he said he was going to double check everything Sat and get back to me the relay still setting on the seat. I wish I was that good, what an ***, didnt mind taken my money. all I aask was double check eveything and see maybe he missed something. but I guess its my fault listen to my freinds and use a backyard person. Bill

  • walmartbill Apr 20, 2009

    Hi, I took it took to a guy in new castle today. He found the problem it was the wiring under the back of the car. the wires was bad and the wire for the fuel pump was broke. So I got my car and it runs fine thanks bill

  • walmartbill Apr 20, 2009

    yes very helpful thanks again Bill

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Hi walmartbill,
  Are you sure that the fuel pump is working fine?
common causes are always - fuel injector or fuel pump.
If you are not sure you can purchase a tester ( Its inexpensive ) :-
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=92699

If fuel pump is fine,
ow, there are 3 wires to the pump. A grey one and a black one.
The grey one supplies power, the black one supplies ground.
Using a Digital Volt/Ohm meter (DVOM), check power to the grey wire when the key is turned to the ON position. Test lights are not good to use, as there is a possibility of fire hazard.

Check fuse marked ECM B (20 Amp) to make sure it is good.

Also, when cranking, does the oil pressure gauge move? The oil pressure sensor for the gauge, is also a fuel pump switch. But with the key on, engine NOT running, the pump should prime. Does it?

Ok, all that said, if the ground is no good at the pump, then nothing will work


If the wires are fine too,
 I guess that's "FUEL PUMP RELAY"......
This is how fuel pump works...
As soon as you turn ON the ignition switch to start the engine a 2 second ONLY battery voltage signal is sent from the computer to the fuel pump relay and from the relay back to the fuel pump in the fuel tank. This runs the fuel pump for ONLY 2 seconds of which pressurizes the fuel system in preparation to start the engine.

Once the engine starts, The computer BYPASSES the fuel pump relay and  sends constant contionous battery voltage from the computer to the oil pressure switch of which is now CLOSED because the oil pressure is UP because the engine is running. Therefore the battery voltage flows thru the oil pressure switch back to the fuel pump to run the fuel pump constantly until you turn OFF the engine.

I hope you would agree and the bet would be either fuel pump/relay.
Thanks for using Fixya.
Do rate the solution.

Posted on Apr 16, 2009

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  • taran_2005
    taran_2005 Apr 16, 2009

    Usually the issue what i have seen on most of the cars is :)


    "Relay"...


     i hope you would be able to fix this.


    Check and let me know once done.


    Thanks for using Fixya.



  • taran_2005
    taran_2005 Apr 16, 2009

    The relay is in the underhood fuse block in front of the right strut tower. 




    Thanks.

  • taran_2005
    taran_2005 Apr 16, 2009

    Procedure to check fuel relay


    There are testing procedures for relays and ohm readings but it differs for all makes. The easiest way is to swap out an identical relay on the vehicle and check to see if the pump comes on. I know that on Ford Rangers there are 3 that are the same ECC, fuel pump, and AC. Since I knew that the ac worked I moved the relay over to the fuel pump and got no response still, so I moved it over to the ECC and both it and the fuel pump worked so that told me that the ecc relay was bad and it in turn triggered the fuel pump relay to activate in series. 





    thanks.

  • taran_2005
    taran_2005 Apr 20, 2009

    Hi walmartbill,



    You would agree that even for a small problem, these tech's would grab few hundred dollars.The fix is really simple. You can again confirm the same with the techy and i hope this time you would be able to fix the issue.



    Any further help, always welcome.



    If you wish , you can close the thread by selecting "Fixya" if 100% satisfied.



    Thanks.

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