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Cadillac Master
21,873 Answers
- Posted on Sep 18, 2012
Re: No grounding of fuel pump in 1996 eldorado
The pump relay is grounded by the computer.
The actual pump is grounded thru the harness coming out of the tank.
The computer grounds the pump relay for three seconds when the engine is cranked and more if it sees oil pressure or RPM.
If the engine does not start, the relay gets no ground signal.
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