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1996 Oldsmobile Aurora NEW FUEL PUMP WON'T WORK

Tiny
LUMPYFISH63
  • MEMBER
  • 1996 OLDSMOBILE AURORA
  • V8
  • 2WD
  • AUTOMATIC
  • 112,000 MILES
A week or so ago, my 96 old aurora died on accelerating to the highway, would not restart, 20 minutes later, started, drove to work left running in parking lot for 10 minutes then died again, towed it home, the next day it ran for about 10 minutes then died, could not restart after that, took to auto shop, they said was the fuel pump and wanted $900 to replace, towed back home replaced fuel pump myself for $300, but am still not getting any fuel flow, relay clicks and there is voltage at the plug to the fuel pump which the second new one put in two days, but it won't run, no hum, no fuel to engine, could it be another fuse, switch or relay that I haven't checked, please help... I have read about faulty inertia switches but am not sure.
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Sunday, August 29th, 2010 AT 11:46 AM

15 Replies

Tiny
BLUELIGHTNIN6
  • MECHANIC
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If there is power all the way up to the fuel pump connector than the pump must be bad or voltage is low. How much voltage was showing at the fuel pump connector?
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Sunday, August 29th, 2010 AT 12:22 PM
Tiny
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It's getting about 10.6v, the battery has been really low, i'm having to jump it to get to start, think that could be the problem
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Sunday, August 29th, 2010 AT 12:59 PM
Tiny
BLUELIGHTNIN6
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Could be, does it start with a jump?
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Sunday, August 29th, 2010 AT 5:40 PM
Tiny
LUMPYFISH63
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No it doesn't, i've tried 2 new fuel pumps but nothing.
Was just out there, i'm beginning to believe it was never the fuel pump, just something telling the pump not to pump maybe, help
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Sunday, August 29th, 2010 AT 5:48 PM
Tiny
LUMPYFISH63
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Are there any other fuses, relays, or switches that i;m not thinking of
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Sunday, August 29th, 2010 AT 5:51 PM
Tiny
BLUELIGHTNIN6
  • MECHANIC
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Let's work backwards, the wiring from the fuel pump is a ground and a power. The power wire comes from the fuel pump relay. You said it's good, yes? From there the power comes from the powertrain control module (PCM). Of course there are some fuses to protect the circuit, but you said it has some voltage so the fuses must be good. Since jumping doesn't start it and relay is also good that leads me to believe the PCM might be at fault.
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Sunday, August 29th, 2010 AT 5:56 PM
Tiny
LUMPYFISH63
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So the pcm would not let the fuel pump run even if it has power? Because at this point i'm beginning to believe that the original fuel pump may not have been bad either.

Does pcm have to be programmed, can I install it myself?
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Sunday, August 29th, 2010 AT 9:09 PM
Tiny
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Really not understanding that, if the pump has power to it than it should run, no way around it. Are you positive that it is getting power? What happens when you provide 12v direct power straight to the pump?
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Sunday, August 29th, 2010 AT 9:55 PM
Tiny
LUMPYFISH63
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Me neither, that was one of the first things I checked, put multi meter on plug leads with key on to check voltage and it was there. Took 1st pump back, got another one, same problem. I'm stumped. Will check voltage again tonite when I get home from work and report results...
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Monday, August 30th, 2010 AT 9:00 AM
Tiny
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Ok, so the wiring harness has a black/white, a black,
a purple, and a gray wire. I get voltage on the puple wire but not on the gray, any thoughts

thx
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Tuesday, August 31st, 2010 AT 9:28 PM
Tiny
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OK, honestly have no clue where you're getting a purple wire from, there is no purple wire on or near the fuel pump according to the schematics. The fuel pump itself will only have 2 wires, a gray wire and a black wire. The fuel pump relay will have 4 wires, a gray, red, black/white and dark green/white wire. The gray wire travels from the fuel pump to the fuel pump relay. The black wire is just ground for the pump. Since gray wire doesn't have power at pump than go to the fuel pump relay and check for power on the gray wire there.
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Tuesday, August 31st, 2010 AT 9:37 PM
Tiny
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The harness has all these wires, maybe other 2 are for fuel guage or something
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Tuesday, August 31st, 2010 AT 9:39 PM
Tiny
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Ok, so I took the bracket loose that holds the relays, there is no voltage on the gray, red or green that go to the fuel pump relay, what now, what should be sending that power.

And by the way, how does the feedback and points system work, I want to do that, but don't know the protocal.
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Tuesday, August 31st, 2010 AT 10:16 PM
Tiny
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The red wire comes from fuel pump fuse (20 amp) that's in the right rear power distribution center fuse block 1 (it's under the right rear seat). This is probably the whole issue here, I'm assuming you haven't checked under the rear seat for fuses?

To give feedback just click on the give feedback link beside my user name. It basically just lets future users know how our techs are doing, whether our advice is good or bad and if we are friendly, mean etc. The more GOOD feedback we get the happier we make our bosses lol ;)
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Tuesday, August 31st, 2010 AT 10:24 PM
Tiny
LUMPYFISH63
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Up and runnin, it was the fuse, I had been under the seat the whole time actually checking the relay, had checked that fuse back before pump change, but not after, da, thx for the help
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Wednesday, September 1st, 2010 AT 6:21 PM

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