The fuel then moves through a rail-mounted pressure regulator and back through a steel transfer line to the tank.Īlthough this system has been used for years, it will more than likely go away as evaporative emissions requirements tighten. This supply system is a closed-loop system as fuel is picked up from the in-tank mounted fuel pump strainer sock and pushed through a steel line into an engine mounted fuel rail. Many systems are in use today, but they can all be divided into return and returnless. Fuel handling is improved as fuel is pushed directly from the tank. Today's supply pumps are usually in-tank mounted to provide good priming characteristics and reduce vapor lock. Much has been said and done with the modern fuel supply system, particularly the fuel pump.
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