Question about 2000 GMC Jimmy

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2000 GMC Jimmy 4.3L CSEFI won't crank. Fuel pressure is 50psi and should be between 55 to 60psi. Fuel filter 1yr old and fuel pump is probably stock & needs replaced but never had problem before replacing injection system. Not getting any solenoid/starter or cranking noise. So could low fuel pressure cause a no crank condition? Parts replaced: lower & upper intake gaskets, new spider injection assembly, new starter/solenoid, new crank sensor new starter relay switch . Major tune up 1yr old, included fuel filter. Battery 2yrs old and alternator checked out.

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No low fuel pressure won't cause a no crank condition check for blown ignition fuse

Posted on Oct 06, 2010

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Check your starter and check your connections to make sure they are clean and tight. The low fuel pressure won't cause a no crank. Too low could cause a no start but not a no crank. I've had starters be bad right out of the box. But if that starter motor isn't turning either the starter motor is bad or the solenoid attached or the wiring to it is at fault.

Posted on Oct 06, 2010

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1 Answer

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.

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YOUR VECHICLE HAS THE CMFI OR CSEFI FUEL METER BODY UNIT WHICH CONTROL THE FUEL PRESSURE.WHICH ITSELF IS YOUR FUEL PRESSURE REGULATOR.

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the battery indicator light usually comes on after a lose of power. Sounds to me like either bad gas, clogged fuel filter or a bad fuel pump. Easiest way to check this is have someone turn the key while you stand at rear side of vehicle and listen for the whinning noise a functioning fuel pump makes as it pressurizes the system.

P.S you dont have to start vehicle to check pump. only requires turning the key to the on position. Good Luck

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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.

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