In the fuel pump to supply oil to the engine, the formation of a certain pressure in addition to the normal supply of fuel nozzle injection, the remaining fuel through the return pipeline to send back to the tank, of course, there are carbon canisters to collect excess gasoline vapors are also returned to the tank through the return pipe back to the tank back to the tank can be excess oil back to the tank can play a role in discharging the pressure of gasoline, but also can reduce fuel consumption.
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