What does the return pipe of Ec7 18 fuel filter do?

Relieve gasoline pressure and reduce fuel consumption.

1 and Ec7 18 fuel filter oil return pipes are mainly used to provide a passage for excess fuel of the engine to return to the fuel tank, which can relieve the gasoline pressure and reduce fuel consumption.

2. The oil return pipe can eliminate the irregular injection of the injector and even block the needle valve, and ensure the normal operation of the diesel engine.