Question about 1999 Ford Explorer

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Pressure on fuel line at 65psi when idling...put it in gear and step on the gas and the pressure drops, and engine bogs WAY down, or kills altogether....fuel pump or pressure sensor??

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Sounds like the fuel pump. Whats happening is that at idle the pump pushes enough pressure to keep the 65psi cause the engine aint pulling that much fuel. Anytime you accelerate, the engine requires more gas, but the pump cant push it and the engine fails. Now it is possible that it could be the sensor but doubtfully as you would have had the problem while idling as well. A easy way to test this is to put the car in park and turn on the ac and headlights. (car should run fine) now put in neutral (should still run fine after stuttering a bit), now place it in drive (should still be stutter) tip the accelerator and it should fail...

now this leaves up with 3 causes..

1.) fuel pressure regulator
2.) fuel pump
3.) sensor.

Start by replacing the fuel pressure regulator
then the pump
and lastly the sensor.

you can follow the instructions here to locate and replace your regulator
http://www.howstuffinmycarworks.com/Fuel_pressure_regulator.html

Posted on Mar 31, 2011

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