This varies depending on your application, but for the most part a complete (all-inclusive) lift pump system is best in terms of affordability and an easy installation process. If you own a Duramax, an engine that was never offered with a factory lift pump, an aftermarket lift pump system will prolong the life of the CP3 injection pump on ’01-’10 models and especially the CP4.2 pump found on ’11-’16 GM trucks. In addition to being the catalyst for making horsepower, complete aftermarket kits provide added fuel filtration, improved water separation and their supply pressure can be adjusted. They provide higher flow rates and stronger pumps that can keep up with the demands of modified injection pumps and larger injectors. In the grand scheme of things, an aftermarket lift pump system is a key element in making horsepower with a diesel.
When the lift pump checks out and 0 psi of fuel is supplied to the VP44 injection pump, it too bites the dust. Take the 5.9L Cummins found in ’98.5-’02 Dodge Ram 25s for example: These trucks were equipped with a lift pump notorious for premature failure. In scenarios where the factory lift pump is on its way out, an aftermarket lift pump is the best possible upgrade. Because the injection pump and injectors are arguably the most vital components in a diesel engine, keeping them supplied with plenty of fuel keeps them cool, lubricated and functioning properly. When You Need OneĪnytime you plan to pursue more power than what your truck made in stock form, a lift pump is a good idea. 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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