Question about 1997 GMC Sierra

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Fuel Pump doesn't come on all the time and it cuts in and out

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First would check the wiring harness to the fuel pump for any loose or corroded connections especially the ground connection the runs to the frame. If that seems good check the the pigtail at the pump for power a good time to do this would be when it's not working so we we'll know whether or not it is losing power to before it gets to the pump.If you have a test light available check for power with that or a DVOM. Does the pump start working after you hit the bottom of the gas tank? If so may have the pump going out. let me know what you find so I can assist you more if needed.

Posted on Aug 28, 2010

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Fuel pump doesn work


This is probably a case where the Inertia switch has cut off the power to the fuel pump. Depending on what Model you drive, will control where the Inertia switch is located.

Ask a question in the Web Search such as "Location of Inertia Switch on Your Year and Model Vehicle". They are usually either in the trunk or behind the front floor kick panels.

The reset button needs to be pressed to restore fuel pump power.

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This make and model doesn't have a fuel pump cut off switch, the switch is only activated by an impact of 3 G's or more on cars and trucks that do use the switch. Spray starting fluid into the air intake of the engine, if it doesn't start you do not have a fuel pressure problem. Lots of things can keep a car engine from starting, you never mention any tests for fuel pressure or spark or proper valve timing (cam drive belt broken or jumped)

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No GM doesn't use a reset switch (really called a "Inertia fuel pump cutoff switch"). The fuel pump is cut off by an oil pressure sensor. If this car has the original pump you likely just need to drop the fuel tank and replace the fuel pump. Does it start if you spray starting fluid into the engine air intake?

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If you actually have no power to the pump and all the fuses and relays are good check the wires for a short and if that is good replace the ignition switch. If you think the condition is no power to the pump because it doesn't seem to power up remove the pump and apply direct power to it to see if the pump is the problem.

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When I try to start it (2000 Pontiac Sunfire), it turns over but just stops - as if it's out of gas but the garage said it's all tied in with the electrical. Four times in 8 months this has...


Try resetting the fuel cut-off switch. This cuts fuel supply to the engine in an accident (if the car was bumped it sometimes sets off). From the trunk, find a hole just bigger than your finger on the side of the car that the fuel filler door is on. Put your finger in there and there should be a button that you can push. Hold it for a second or two should be fine. If that doesn't work, try it again with the key turned in the ignition (not with the engine running but enough to turn on the heater fan). If that doesn't work, it will be something else that i cannot diagnose from here. Good luck.

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1 Answer

I have an 04 colorado. I just put a new fuel pump and filter in it. Now it wont start I drained all the old gas out and put fresh gas in. I hear the fuel pump working and checked to see if I had fuel...


If you have gas, and the fuel pump is working, all i can suggest is cycling the ignition on and off several times to fill the system. Don't turn the engine over, just turn the key on until the fuel pump cuts out, and repeat. Do this several times. If gas is the problem, it should fire up. If it doesn't, better check for spark. Let me know how you make out.

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SOUND LIKE FUEL PUMP FAILED, CHECK FUEL PUMP FUSE AND RELAY.

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1 Answer

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No this does not affect the fuel pump. It will affect the spark though. Hit the gas tank in the center a few times. If it starts then replace the fuel pump. Unfortunetly pumps with a few yaers on them will die when ran out of gas. If it doesn't start pull one of the spark plug wires, insert a screwdriver and put it close to the engine. crank the engine and watch for a spark. if there is no spark then replace the crank shaft sensor. before you replace the fuel pump.

Jul 01, 2011 | 2003 Kia Sedona

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