Question about 2000 GMC Jimmy

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Question: 2000 GMC Jimmy mileage: 97,000. The car wouldn't start. Replaced the fuel pump twice and still no start. The fuel pressure would only go up to 55 psi. Finally got it started the other day, but only after I put some fuel in the intake? The car seems to run fine in the drive way. Today it done the same thing I had to put fuel in the intake again. That is the only way it will start. What can be the problem?

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  • whitley3131 Oct 02, 2009

    Yes I just whent out and the fuse is good.

  • whitley3131 Oct 11, 2009

    I got it out on the road and it runs fine.

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I have the same issue with my buddies jimmy the problem seems to be the injector because when you get it out on the road the car is lacking fuel and the injectors are unable to supply it this is a regular problem with the 4.3 liter vortec

Posted on Oct 04, 2009

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Sounds like the fuel injectors are not delivering fuel, this can be a shorted engine harness, have you checked ECM fuses in uhnder hood fuse box drivers side?

Posted on Oct 02, 2009

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1 Answer

2000 GMC JIMMY What controls turning on fuel pump


The pump is powered by the relay. The relay is grounded by the computer. It gets a ground signal for the first 3 seconds, then only if the computer sees oil pressure or RPM to know the engine is running.
You should be able to ground the relay and run the pump for several minutes. After 30 seconds you should be at max pressure.
Normal pressure is 15psi for a truck that has throttle body injectors such as a mid 80s model, and 65psi for trucks that have port fuel injection like yours.
You may have the wrong pump.

Sep 05, 2012 | 2000 GMC Jimmy

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This happened to me I had to spray Starting fluid everytime eventually. Starting fluid wouldn't work after awhile. Its the fuel pump. Even though it comes on and works its not producing enough fuel pressure to start the engine. It's probably giving about 12-13lbs of pressure but it needs atleast 14lbs. of pressure. And a word of advice to buy a ACDelco original fuel pump if you don't want to have to replace it again in 1-2 years, it's more expensive but will last.

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2000 GMC Jimmy, starts up every time, but only runs for 10 seconds then dies. Restarts every time but will not stay running. Replaced fuel pump, fuel filter, CAM position sensor, crank position sensor,...


you say fuel pressure is good, but what is it? what is the fuel pressure when it stalls out? Spec is 60-66 psi and it wont run if its 55 psi. the fuel pump relay should be good if the pump runs. Make sure the ground for the pump is good , G402 should be on left frame rail. you may have had it off to replace the pump? maybe? it may be time to stop guessing and have a repair shop diagnose it for you. You sure have replaced a lot of good parts.

Sep 07, 2011 | 2000 GMC Jimmy

1 Answer

2000 gmc jimmy shut off while driving, replaced fuel pump relay, did not help. checked fuel pump and filter, both seem okay. after disconnecting and reconnecting fuel filter, vehicle started and ran very...


Replace the fuel filter first. When you turn the key on, the fuel pump should run for a few moments, then turn off. If it keeps running, then replace the pump as well. Suggest having the fuel system pressure checked at the engine itself. Hope this helps!

Sep 29, 2010 | 2000 GMC Jimmy

3 Answers

2000 GMC Jimmy won't start


i had the same problem and replaced the fuel pressure regulator. Cost about $45 at advance auto store or about $90 at napa auto stores. Once i replace that my truck started right yup and runs like a champ

Jun 13, 2009 | 2000 GMC Jimmy

2 Answers

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Poor fuel pump wiring connections is causing your problems, do u live in a salt state?

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2000 gmc jimmy wont start fuel pump comes on and cuts off but will not start.I have changed the fuel filter and that did not work. Is the pump not building the pressure it needs to start or would my...


the fuel pressure if leaking could cause this the regulator is located under the intake plenum but you should smell gas .if you dont then most likely the pump is bad ,the pump will come on for 2 seconds when the key is on then go off it will not stay on with just the key on only when you crank it will it .so have your fuel pressure checked with a gauge.

Mar 22, 2009 | 2000 GMC Jimmy

1 Answer

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Aftermarket pump or OEM? If aftermarket, take it back and get a new one. Before you go through all that though, you may want to check the fuel pressure. You need to check the specifications on what the pressuresupposed to be for this model.

Feb 21, 2009 | 2000 GMC Jimmy

1 Answer

2000 gmc jimmy wont start fuel pump comes on and cuts off but will not start.I have changed the fuel filter and that did not work. Is the pump not building the pressure it needs to start or would my...


When you hook the pressure test guage to shrader valve on fuel rail what it reads is what the pressure is from pump, around 60 p.s.i. all you need to do is hook up the guage and turn on key, you do not have to turn engine over, and if pump is good it will shoot up to 58 or 60 right now.

Feb 14, 2009 | 1999 GMC Jimmy

1 Answer

2001 gmc jimmy not starting


Did they do a fuel pressure pressure test to determine that its fuel pump? And if so what was the p.s.i.?It should be around 55 to 60 p.s.i. a few pounds under 55 p.s.i. Pump needs replaced, Your shop should have chk. this when it was there the first time. Did they by chance chg. the fuel filter, that can hinder it from starting too.

Feb 14, 2009 | 2000 GMC Jimmy

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