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Lift pumps only assist in the raising of fuel levels in a given vehicle, they do not push fuel through the system. Modern fuel injection systems changed all that by electronically creating positive pressure from inside the fuel tank in order to force fuel through the system and into the engine block.

Early versions of the fuel pump used mechanical elements to move fuel from the gas tank into the carburetor and then on to the engine, which worked primarily as a low pressure system. Fuel Pump FunctionsĪ fuel pump is a mostly essential (older vehicle's use a gravity system to force fuel into the engine) component of an automobile's fuel system. Lift pumps have several applications beyond automobiles and are also used in sewage systems to pump out waste from a full sump pump. In automobiles, the fuel lift pump works to build pressure or suction in the gas tank, thereby encouraging the fuel level to rise to the injection systems and on to the engine block. The various grinds allow you to select a cam that optimizes torque in the RPM range you require without compromising performance elsewhere.Ī lift pump functions to raise the level of fuel or other liquid up through a given system. TTS Camshafts are designed to provide smooth power delivery throughout your engine's entire operating range. This pump will fit all 94-98 5.9 12V engines with the P7100 Injection Pump.