Fuel System Overview

This vehicle utilizes a returnless design Fuel System. The fuel pressure regulator is a part of the primary fuel tank module, eliminating the need for a return pipe from the engine. A returnless Fuel System reduces the internal temperature of the fuel tank by not returning hot fuel from the engine to the fuel tank. Reducing the internal temperature of the fuel tank results in lower evaporative emissions. The fuel pump module, located in the fuel tank, supplies fuel through the fuel feed pipe to the high pressure fuel pump. The high pressure fuel pump supplies fuel to a variable-pressure fuel rail. Fuel enters the combustion chamber through precision multi-hole fuel injectors. The engine control module (ECM) enables the fuel pump module using a relay. The high pressure fuel pump, fuel rail pressure, fuel injection timing, and injection duration are controlled by the ECM.