Question about 1990 Mercury Grand Marquis

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Where is the fuel pump relay

I chane out my fuel pump need to fined the fuel pump relay

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It should be in the fuse box

Posted on Nov 25, 2014

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Hey Mudkicker,

Who ever thought of putting an electric fuel pump inside a tank of gas........

Check your other gauges for accuracy. They do that when a ground is loose.

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The fuel pump relay is activated by the ECM, Check the fuel pump fuse and both ECM fuse on the fuse panel on the side of the dash. The ignition energizes the ECM which energizes the Fuel Pump relay which powers the fuel pump. Check the power for the fuel pump at the frame rails by the fuel tank. It's common for that area to get corroded and the wires break easy when the fuel pump has been replaced. That short section of wire harness is only $12.00 if need to be changed. If you have a few friends, you can remove the box from the frame since it's only being held by 6 blots so you don't have to drop the gas tank. The other thing you can try to do is to run a hot wire to the pump wire harness after you disconnect it so you don't loop the electrical and see if the pump works. Good luck and keep me posted.

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if you really have a carburetor as you say, you have a mechanical fuel pump so you will not have a fuel pump relay. if you have fuel injection then you do have a fuel pump relay, need to know which engine it is to help more.

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