How the fuel pump works

Fuel pump is a professional term in the auto parts industry. It is one of the basic components of the fuel injection system of electronic fuel injection vehicles. It is located inside the fuel tank of the vehicle. The fuel pump works when the engine is started and the engine is running. If the engine stops and the ignition switch is still off, the control module turns off the power of the fuel pump to avoid accidents. ignition.

How the fuel pump works:

1. The fuel pump delivers high-pressure fuel to the fuel branch pipe to ensure continuous fuel supply to the fuel injector.

2. The fuel pump is composed of an electric motor, a pressure limiter and a check valve. The electric motor actually works in the fuel in the oil pump casing. Don't worry, because there is nothing that can be ignited in the casing. The fuel can lubricate and cool the fuel motor. A check valve is installed at the oil port, and a pressure limiter is located on the pressure side of the oil pump housing with a passage to the oil inlet.

3. When the rotor disc rotates, the roller is pressed outward by centrifugal force, like a rotating oil seal, the rotor rotates, the pump works, sucks fuel from the oil inlet, and presses the fuel into the fuel system from the oil outlet, when it is closed When the fuel pump is running, the check valve at the fuel outlet is closed to prevent the fuel from flowing back to the fuel tank through the fuel pump. The fuel line pressure maintained by the check valve is called "residual pressure".