How To Wire A Relay For Fuel Pump

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How to wire a relay for fuel pump. Wire the oil pressure switch s s terminal to the ignition cranking start circuit to provide fuel pump pressure during engine cranking and or via a dash mounted toggle switch to prime empty. So use a larger gauge wire for lower voltage drop. The 30 position on the relay will go to a fusible link in line fuse or circuit breaker. Turn off the ignition after the fuel pump stops making noise.

Wire which leads inside the vechicle to the ign spade lug connector on the fuse box. Join one more wire to the 85 terminal of the relay which acts as the ground wire. So now instead of the stock ecu energizing the fuel pump it will energize this relay. The 86 position goes to a 16 ga.

You need to run at least a 10 ga. You may have to have an additional person touch the fuel pump relay to feel the buzz or clicking motion. Join the black wire from the fuel pump to the 30 terminal of the relay and the black wire from the wiring harness to the 86 terminal of the relay. Listen for the fuel pump to activate.

Wiring in the fuel pump relay. This wire will connect to the 87 terminal position. If you are using a fuel injection system then you need to use the fuel pump signal as the trigger for the relay. The diagram is color coded per circuit and only a few things may need to be said.

For carbureted engines you can connect the relay to a switched ignition source must have power in both start and run key positions or you can simply wire in a manual switch. Wire from the fuel pump to an under hood relay. This 12v wire will now energize the relay to turn on. Scrape off as much corrosion as you re able to so the relay has a solid connection when you plug it back in.

Turn the key on again and listen for the fuel pump relay to buzz or click. Basic safe electric fuel pump wiring diagram this is the basic wiring diagram for safe electric fuel pump wiring. The other side of your fuse device goes directly to the battery terminal. Wire pin 85 of the relay to the 12v supply wire from the stock ecu that you just cut.

Fuel pump wiring for the red circuit is generally going to carry a much higher current than the relay. Hold the relay upside down so the prongs point up and firmly scrape them with a wire brush. How to connect a fuel pump relay get the book at amazon.