Automotive Fuel Pump Relay - Honda Civic

replace relay with larger load type

It's always a good idea to check just how much current the fuel pump is pulling. If there is a problem with either the fuel pump or the wiring, relays alone cannot correct the problem. Its a simple test , place an ammeter in the line and get a reading of just how much current is being used to run the pump. The best place to obtain the reading is right after the relay. If the reading is within limits, it is possible the relay is not of sufficient size to maintain the load.

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If your fuel system has low and high speed circuit, check the current directly in the fuel pump as soon as the engine starts or rev it at 2000 ~ 3000 rpm because current is max in this condition. The procedure mentioned by one guest is correct, you can follow it.

If I were you, better to use the original parts because it was designed especifically to your vehicle. Starting from fuse/relay amperage & diameter of the wire harness.

Cheer up...

If you replaced the OEM fuel pump with an aftermarket pump, it was most likely because you wanted more fuel for your engine. More fuel will require more power to pump it. More power will require a higher current relay. Higher current relays will require larger wires. Have you seen how thin the wires are on Honda circuits?