Continued fuel starvation will eventually damage the injection pump and possibly hurt the injectors. Without adequate diesel feeding into the low-pressure side of the injection pump, its life span is greatly reduced. Without being supplied low-pressure fuel via the lift pump, the injection pump would have the added job of pulling fuel all the way from the fuel tank (which is the case in Duramax applications). From there, the injection pump or injectors (depending on which engine and injection system the engine has) pressurize the fuel that makes its way in-cylinder between 15,000 and 30,000 psi. Most lift pumps, aftermarket or OEM, provide between 8-to-15 psi worth of supply pressure (aside from the 7.3L, 6.0L and 6.7L Power Stroke engines, which call for 45-to-65 psi). The job of a lift pump is to supply low pressure fuel (from the tank) to the injection pump on the engine. In this day and age, it’s actually rare to peer under a diesel powered pickup and not see an aftermarket lift pump system bolted to the frame rail. In addition to making big horsepower a reality, they add reliability to the entire fuel system, yield improved filtration over stock and (if electric) offer infinite adjustability over fuel pressure. For diesels, lift pumps are the unsung heroes of their respective performance world. While nowhere near as glamorous as a billet wheeled turbocharger, a polished intake or a second injection pump, this component is as vital as it comes in the horsepower game.
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