Question about 2004 Pontiac Sunfire

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2004 Pontiac Sunfire Does crank position sensor control fuel pump?

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  • dandeeranch Nov 30, 2008

    Thanks, jr0353. My husband already tried all this. He indicated there is fuel on the rail; when you crank the engine, the tachometer does not move. I don't know what else he said and he's not in the house right now for me to ask. We were hoping to not have to spend the money on a fuel pump, so we're trying/hoping for other solutions first. Someone else had suggested to us that it might be the crank position sensor, but we haven't bought one of those yet.

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No, when you turn key on you should hear pump run for 2-3 seconds, if not check fuses, then if fuses are good have someone tapped fuel tank with rubber hammer as key is turned on, if fuel pump runs after tapping tank, replace fuel pump

Posted on Nov 30, 2008

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That can be the symptom of a bad Ignition Control Module, or also a bad crank position sensor. The ICM can be taken off and tested for free at any parts store. The crank sensor circuit can be tested on the car with a multi-meter. Also small motors (like a fuel pump motor) that are starting to fail can sometimes work until they get hot and then stop working until they cool down again.

Next time the car shuts down and won't restart, check for spark on a spark plug wire with the engine cranking over. If you have no spark, suspect the ignition control module or the crank position sensor. If you still have spark, but won't start, check if the fuel pump is putting gas up to the engine.

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1 Answer

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