What is the function of a fuel pump in an engine?

The function of a fuel pump in an engine is crucial as it is responsible for supplying fuel from the fuel tank to the engine's fuel injection or carburetion system. This process ensures that the engine receives a consistent and adequate flow of fuel, which is necessary for optimal combustion and performance. The fuel pump operates under varying conditions, adjusting its output to meet the engine's demands during different operating states, such as idling, acceleration, and cruising.

When the fuel pump pulls fuel from the tank, it must overcome resistance presented by fuel lines and the fuel filter, ensuring that the correct amount of fuel reaches the engine's system. If the pump fails or does not perform effectively, it can lead to fuel starvation, resulting in poor engine performance, misfires, or failure to start. Therefore, the primary purpose of the fuel pump is vital in maintaining the operation and efficiency of the engine.