Bosch Fuel Pump,Pump, fuel pre-supply
OE number 440020088

A fuel pre-supply fuel pump in a car is an essential component that plays a critical role in the fuel delivery system. Its primary function is to supply pressurized fuel from the fuel tank to the main fuel pump. This pre-supply pump operates at a lower pressure compared to the main pump but is responsible for ensuring a consistent supply of fuel to the engine.

In operation, the pre-supply fuel pump is typically located inside the fuel tank. It draws fuel from the tank and pushes it towards the main pump, often through a fuel filter. This pump ensures that the fuel system is constantly primed and ready for combustion. By maintaining a steady flow of fuel, it prevents any air bubbles or debris from entering the main pump and clogging the fuel lines, which could eventually cause engine malfunctions. Overall, the role of a fuel pre-supply fuel pump is crucial in maintaining the efficient and reliable operation of a car's fuel delivery system.