The fuel pump relay is a small unit covered in a plastic case, which has several sprockets on one side that are clipped onto the ignition system. The fuel pump relay is what turns on the fuel pump when you start your car and powers it down when you shut off the ignition.
The engine control module (ECM) uses the fuel pump relay to control when the fuel pump is on. The fuel pump relay supplies electricity to power up and power down the fuel pump.
It's located in different places on different cars. It could be under the hood, on the firewall, on one of the fender covers or near the steering column, to name a few locations. As for a Nissan Terra (
Nissan Terra ?????), it is often found in the fuse box located in the engine bay.
When you turn the key in the ignition forward to crank the car, the "start cycle" begins and fuel pump relay is engaged long enough to turn on the fuel pump. It shuts off again when the engine is running. Once the engine is running, the fuel pump relay shuts off, and the current for the fuel pump is supplied by the oil pressure sending unit. The other time the fuel pump relay is engaged is when you shut off the ignition. It engages long enough to shut off your fuel pump.
Hi DAVID BREWSTER, I want to help you with your question, but I need more information from you. Can you please add details in the comment box?
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