What is a fuel pump?

Speaking of the automobile fuel supply system, the first thing that everyone thinks of is the fuel pump, because there is no fuel pump to supply fuel to the engine, so what exactly does the fuel pump do? Listen to the editor slowly.

Considering the problems of heat dissipation, sound insulation, and air resistance, the current fuel pump is built into the fuel tank. The main function is to suck the fuel out of the fuel tank, pressurize it and deliver it to the fuel supply pipe, and cooperate with the fuel pressure regulator to establish a certain amount of fuel. pressure.

Generally speaking, the fuel pump we call is actually a fuel pump component, which is an integrated part, which contains multiple components, mainly including filters (fuel filter, suction filter), fuel pressure regulator, fuel pump , Fuel gauge sensor unit (oil-containing float).

Let's introduce each component separately.

1. Filter

The filter includes suction filter and fuel filter, commonly known as coarse filter and fine filter, mainly to filter impurities in the fuel. The main role of the two is the fuel filter. The structure of the fuel filter consists of an aluminum shell and a stainless steel bracket. The bracket is equipped with high-efficiency filter paper. The filter paper is shaped like a chrysanthemum. Increase the circulation area. Its main function is to remove the iron oxide, dust and other solid impurities in the fuel, and prevent the fuel system from clogging (especially the fuel injection nozzle).

2. Fuel pump

The fuel pump is the core component of the fuel pump assembly. Its main function is to suck fuel out of the fuel tank and deliver it to the fuel pipe.

3. Control circuit:

When and how long the fuel pump works are controlled by the ECU according to the actual conditions of the vehicle. The fuel pump is directly powered by the battery, and the fuel pump relay controls its on and off. The fuel pump circuit problems are mostly caused by the failure of the fuel pump relay.