Fuel Pump Relays - Allows Current Through To The Fuel Pump
Fuel Pump Relays – Allows Current Through To The Fuel Pump

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Fuel Pump Relay – Function And Testing Procedures


Fuel Pump Relays – Allows Current Through To The Fuel Pump

So, When you turn the ignition on, the fuel pump relay will supply a consistent voltage to the fuel pump. Therefore, problems with the fuel pump relay will result in the fuel pump malfunction. A bad or failing fuel pump relay will often show symptoms to tell the driver something is wrong.

So, What are Fuel Pump Relays?

Fuel pump relays are necessary component for the combustion engine model to function. The combustion engine needs fuel to run, and the fuel pump relay ensures that the engine gets what it needs. The power control module (PCM) or ignition usually controls the fuel pump relay. When you turn on the ignition, the fuel pump relay powers up the fuel pump. When you shut off the ignition, the fuel pump relay powers down the fuel pump.

Common Locations

So, The fuel pump relay is usually located in one of the fuse boxes. Basicly a long black box which contains fuel pump relay along with various other fuses and relays.

Basic Functions

When you turn the key in the ignition to start your car, the “start cycle” of the engine begins. And, By turning on the ignition, the fuel pump relay powers up the fuel pump. The key here, is to produce a small amount of voltage, but consistently to the fuel pump. Once the engine is running, the fuel pump relay shuts off. Consequently, the electricity for the fuel pump is now supplied by the oil pressure sending unit. When you shut off the ignition, the fuel pump relay is disengaged and shuts off the fuel pump.

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