Question about 2000 GMC Jimmy

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I HAVE CHANGED THE PUMP TWICE BUT THE PROBLEM CONTINUES

I MY PROBLEM IS WITH MY 2002 GMC SONOMA THE FUEL PUMP SEEMS TO GET HOT AFTER A WHILE AND IT TURNS OFF BUT AFTER 10 MIN. IT STARTS AND RUNS JUST FIN

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Renew the fuel pump the windings are shorting out causing it to overheat

Posted on Jul 07, 2010

  • edwardocegue Jul 07, 2010

    I'VE REPLACED IT TWICE, STILL THE SAME PROBLEM, MAYBE BECAUSE IT WAS A USED PUMP? SHOULD I TRY A NEW ONE.

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1 Answer

I installed a fule pump and started right up, and then stopped runing again, I was going to clean fuel filter, and fuel kept flowing throuule the fuel line. I changed fuel pump relay five times, I...


Maybe the oil pressure sensor or switch that keeps the pump running after engine started.

If you jumped 87 and 30, it should have turned the pump on. If those are the right terminals at the fuel pump relay, and I think they are. Those are usually the right ones.
Try this: one of those terminals should be hot at all times, the feed for the fuel pump. Check for a hot terminal there. If the feed for the pump is lost, it will probably be a blown maxi fuse or fusible link supplying that relay's power feed.
If it still starts and dies, check the fuel pressure. If pressure is at specification, both key on, engine off and with engine running, it could be an ignition problem (crank sensor?), not a fuel problem. But you may be right to pursue the oil pressure switch or the pcm, if the pump was still running as you say at the fuel filter .

At terminals 85 and 86 of the pump relay, you could check for the computer signal on one of those with the engine cranking. With engine cranking, the computer sends a signal to the coil side of the relay, either the 85 or 86 terminal, and the other terminal will go to ground. Do you have a test light or voltmeter?

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Hello...
The Sonoma has a Fuel Pump relay controled by the ECM "B" fuse and the ECM/PCM itself.
The relay is in the underhood relay box. 30 will be hot all the time 85 is your key. It will become hot for 3 seconds when the key is initially turned on. It will stay alive when the key is in the run or on position B if the ECM/PCM is working correctly.
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What would cause a fuel pump to overheat


When the fuel pump is short circuit it will start going bad and thus gets hot. Replace witha brand new one. It will not cost much.

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Mar 24, 2009 | 2000 GMC Sonoma Extended Cab

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