Duramax Fuel Filter Problem

One of the most common problems with this design that 66l duramax fuel pump repair experts point out is that over time a crack tends to develop in the fuel filter. Chances are if youre looking at this page youre well aware of the problem. They can leak at the cloth covered rubber return lines at the injectors these lines can only be replaced in sets left and right side they are expensive.

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A common problem with high mileage 2001 2010 duramax trucks is that the fuel filter head assembly begins to develop air leaks.

Duramax fuel filter problem. See and avoid the new plastic composite wix fuel filter for the duramax unless you like to limp your engine from air in the fuel. Gm part number 12642623. Comes from a bad wif threaddesignwhatever air leak at the bottom of the plastic filter. Fuel filter housing oring leaks the duramax fuel system does not have any sort of low pressure fuel pump pushing fuel to the engine from the tank.

The injection pump sucks all the fuel from the tank. Common issues and problems we see in the shop with the lb7 66 duramax engine. Replacing the fuel filter head on the 2007 classic lbz duramax. Just had the fuel filter changed two weeks ago and the truck went into limp mode say reduced power.

Duramax diesel fuel filter head rebuild how to by. The engines cp3 high pressure fuel pump is capable of drawing fuel from the tank without the aid of an external lift pump as long as the system remains primed. The most common issues 66l duramax fuel injector repair experts often point out is air getting stuck in the fuel lines and fuel starvation. The 2011 2016 duramax suffers from a high pressure fuel pump issue unique to this year range.

Dealer says it was clogged up. Fuel leaks on a duramax are almost always on the return side of the system the smaller of the two fuel lines traveling down the frame rail going to the fuel cooler and back to the tank. The design of the filter housing is the cause as duramax does not utilize a pump. Had to have the fuel filter changed again.

Failure of this cp4 pump is usually catastrophic causing instant contamination of the entire fuel system with metal particulates. Fuel starvation andor air in the fuel lines the duramax diesel is susceptible to fuel starvation and getting air in the fuel lines. First problem with the lbz fuel head replacement. Dealer also says that he has had a lot of the same trucks in for the same thing.

This can be contributed to the fuel filter housing design and the fact that the duramax does not use a lift pump. Rather the high pressure fuel pump injection pump is responsible for vacuuming fuel from the tank. I have a 2500hd with a duramax lmm new body style. Instead the engine operates by vacuuming the fuel from a tank with the help of an injection pump.