Location: Pittsburgh, PA
Posts: 131
My VIN: 3610
So the car ran great two weeks ago, but now won't start. After some checking, 12v straight to the fuel pump runs it but no power is getting to it.
I've checked that the relay is receiving 12v. 12v to ground on the relay socket is good, and bypassing it yields no results.
Fuses 1 and 7 are receiving 12v.
What else should I be doing.
Location: Leonardtown, MD
Posts: 9,005
My VIN: 03572
Sounds like your inertia switch may have opened.
Location: Pittsburgh, PA
Posts: 131
My VIN: 3610
It wasn't popped up when I checked, is there something I'm missing.Originally Posted by Bitsyncmaster
Location: Leonardtown, MD
Posts: 9,005
My VIN: 03572
You need to put a meter on the connections on the fuel pump. Then you can determine if it's the ground side or power side at fault.
Location: Pittsburgh, PA
Posts: 131
My VIN: 3610
I have continuity between relay socket and the positive lead of the fuel pump, and continuity between the inertia switch socket and negative socket of the fuel pump.
Location: Pittsburgh, PA
Posts: 131
My VIN: 3610
When I jump the relay I only get about five volts at the fuel pump to ground.
Location: Leonardtown, MD
Posts: 9,005
My VIN: 03572
If your meter ground was on the battery neg post then you have proven the power side of the pump is bad since your dropping about 7 volts somewhere. First think to check is the pump two pin connector.
Location: Pittsburgh, PA
Posts: 131
My VIN: 3610
Yes, it is two pin
Location: Pittsburgh, PA
Posts: 131
My VIN: 3610
Update!
When jumping the relay and jumping the inertia switch while still using the fuel pumps natural wires, the pump runs.
Jumping inertia switch with relay plugged in, pump does not run.
Possible bad relay and switch?
Location: Leonardtown, MD
Posts: 9,005
My VIN: 03572
Pump will run down to about 7 volts. You will want to measure the voltage across the pump to make sure your getting good voltage. It would be unlikely your RPM relay and inertia switch went bad at the same time.
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Dave M vin 03572
