We replaced the fuel pump in a 2001 gmc Sonoma 6cyl and the truck will not start now. We knew the fuel pump was bad because you would need to bang the tank to get it to kick in, then it just quit. We took the tank down, replaced the pump and reinstalled the tank and did all the correct wiring. The pump will whirl when the key is turned to the on position, the truck will crank,but it will not fire. It sputters slightly but will not start.Is there a step we aremissing? Priming the lines? An electrical issue perhaps. We had the battery disconnected. Will that trigger some reset that we need to do? Thanks
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Re: 2001 gmc sonoma fuel pumpeplaced,ot starting now
Check your fuel lines, make sure supply line is connected to fuel pump outlet,and the return line is connected to the return pipe on tank. I did hook them up backwards (I KNOW) when i tried to start the car i heard the pump but car wouldn't start (no fuelgetting to engine) checked lines and changed them to correct locations , car started right up I hope this helps
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2001-2004 gmc sonoma 4.3 [X, W Eng.] fuel system specs: 60-66 psi when you turn the ignition key (fuel pump) on without starting the engine. If fuel pressure drops back down quickly after fuel pump stops working (works for only 5 sec.) then you have a bad fuel pump or leaking injector spider.
Hello , The area you need to check ( check owners manual) is most likely this is two issues that could be. It could be your fuel pump relay , that is what triggers your fuel pump to work.Or your fuel pump itself. However first thing I would check is your fuel pump relay, which is normally square like fuse, check fuse box area, or sometimes it is under hood near firewall in a box, with other fuse relays. Thanks Mike
just swap it with another relay in the box, also check the fuse panel in the pickup for blown fuses. Also when you turn the ignition switch on listen for the pump to come on if you do not hear it. Get an ohm meter and check the wiring at the pump for voltage going to the pump. If there is none start with the fuse box in the cab.
Check for vacumn leaks ! Idle air compensator? clean throttle valve oppenings and air port opening,do you have check engine lite on,check EGR valve? Dirty fuel injectors ,bad pressure regulator?Check fuel pressure at fuel rail,at idle !
Check you Cranckshaft Position Sensor....i have a 99 GMC Sonoma and i had the same problem. It would not start in the morning, and i replaced everything i could think of. ignition coil, distributor cap and rotor, wires and plugs and no luck. I could hear the fuel pump prime when i turned the key on, so i knew it was getting fuel. As it turned out the sensor (which is located on the front and bottom of the engine block just behind the Crankshaft drive belt pulley.) and was preventing the engine from starting. Check that out and that may be the cause of your problem