The fuel system is to supply a certain amount of clean, well-atomized gasoline to the engine according to the needs of the engine's operating conditions, so as to mix with a certain amount of air to form a combustible mixture. At the same time, the fuel system also needs to store a considerable amount of gasoline to ensure that the car has a considerable driving range. Fuel system composition: It is composed of refueling cap, refueling pipe, fuel tank, oil pump, gasoline filter, carbon canister, carbon canister cleaning valve, pipeline and other parts.

The layout of the fuel system has an important impact on the performance of the fuel system, and a reasonable arrangement is equivalent to adding insurance to the system, which can easily pass the national regulations and has no potential safety hazards. The fuel system layout generally follows the following 3 principles:

1. Priority: After the fuel tank is arranged, priority is given to the placement of oil filters, carbon canisters, solenoid valves and other components.

2. Interferalism: The fuel system parts shall not interfere with the peripheral parts, and meet the requirements of assembly, disassembly and testing.

3. Heat insulation requirements: fuel system parts should be kept away from heat sources such as exhaust systems as far as possible, and heat insulation protection should be added if they are too close to the heat source.