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John, Master A.S.E Automotive technician
Category: Chevy
Satisfied Customers: 9176
Experience:  A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
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1996 chevy impala: fuel pump..oil pressure sensor, crank sensor

Customer Question

1996 chevy impala no power to fuel pump, pump does work, replayced oil pressure sensor, crank sensor, still no start
Submitted: 7 years ago.
Category: Chevy
Expert:  John replied 7 years ago.


Make sure the fuel pump fuse (under hood electrical center) is good & there is voltage on both sides of the fuse.From here the voltage travels to the pump relay on the orange wire & goes from there to the fuel pump on the gray wire.The computer energizes the relay to pass current when the ignition is first turned on for 2 seconds.

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Customer: replied 7 years ago.

the fuse is good ive also replaced the relay. i can get the car to run by a wire put a 12 volt termanel thats on my fuse box under the hood and the other end of the wire to a fuel pump wire (red with a black connector) by the fuse box.. before this all started the car had 2 codes p0200 and p0300 the car would coming to a stop would shake back and forth and on a green light itd fall on its face, i dont know if those codes would have any effect of what the problem is now? also when i started the car with the 12 volt source and that wire. the fan kicked on and wont shut off untill the motor stops running. maybe a PCM problem?

Expert:  John replied 7 years ago.

It is always possible,but make sure you have current going through the fuse & relay & not a bad connection there stopping the current flow.

The P0200 is an injector control circuit usually caused by a shorted fuel injector.The P0300 is a missfire code which may have been set from the other.You will need to recheck once you get it started.