For the electric fuel pump application, the relay-actuating switch will be a common three-prong oil-pressure switch that screws into a 1/8-27 NPT oil pressure port on the engine.

The electric fuel pump is generally on whenever the car's ignition switch is in the "on" position. Depressing the gas pedal results in the throttle body opening on the engine (metering the air ...

1. If no fuel pressure is present, use a test light to verify that all of the fuses are working. 2. Assuming the fuses check out, you’ll need to gain access to the fuel pump (Image B).

Electric fuel pump: An electronic fuel injection system on modern vehicles requires higher pressure, which is accomplished, in part, by using an electric fuel pump rather than a mechanical module.