A common question we are going to answer today is, should I put a lift pump on my LB7 Duramax?

To properly answer why you should put a lift pump on a LB7 Duramax is to first understand why a Duramax lift pump is important and what does the lift pump actually do? The stock LB7 Duramax fuel system is made up of 2 key components. The injection pump, also known as the CP3 pump, operates at high pressure and draws fuel from the fuel tank to feed the injectors. The injectors receive the fuel from the Duramax CP3 and deliver diesel fuel into the engine cylinders.

The stock Duramax LB7 fuel system has no water air separation which is a major benefit when switching to a Duramax LB7 lift pump because the lift pump system removes water and air from fuel. Water and or air in diesel fuel is extremely detrimental to the costly LB7 CP3 pump and all Duramax fuel injectors.

Speaking of dangerous air in diesel fuel, because of the way the Duramax injectors are feed by the CP3 drawing fuel from the tank using vacuum, there is no way to eliminate the air from the fuel without a LB7 lift pump. The Fass Duramax LB7 lift pump is a electric fuel pump that feeds the CP3 with a constant flow of clean airless fuel, cutting out the vacuum actions that allows air to enter the fuel system. The Fass Duramax lift pump also filters fuel down to 2 microns while untiring a water and air separation filter that removes 99% of water from fuel.

In order to truly maintain a clean fuel system that contains little to no air or water, a Duramax LB7 lift pump is one of the best LB7 upgrades anyone can preform.