First problem with the lbz fuel head replacement. 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.
The most common issues 66l duramax fuel injector repair experts often point out is air getting stuck in the fuel lines and fuel starvation.
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Duramax fuel filter problem. Common issues and problems we see in the shop with the lb7 66 duramax engine. Fuel starvation andor air in the fuel lines the duramax diesel is susceptible to fuel starvation and getting air in the fuel lines. Rather the high pressure fuel pump injection pump is responsible for vacuuming fuel from the tank.
This can be contributed to the fuel filter housing design and the fact that the duramax does not use a lift pump. 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. Had to have the fuel filter changed again.
The 2011 2016 duramax suffers from a high pressure fuel pump issue unique to this year range. Failure of this cp4 pump is usually catastrophic causing instant contamination of the entire fuel system with metal particulates. Instead the engine operates by vacuuming the fuel from a tank with the help of an injection pump.
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. Chances are if youre looking at this page youre well aware of the problem. A common problem with high mileage 2001 2010 duramax trucks is that the fuel filter head assembly begins to develop air leaks.
Just had the fuel filter changed two weeks ago and the truck went into limp mode say reduced power. The design of the filter housing is the cause as duramax does not utilize a pump. Duramax diesel fuel filter head rebuild how to by.
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. Comes from a bad wif threaddesignwhatever air leak at the bottom of the plastic filter. 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 injection pump sucks all the fuel from the tank. Dealer says it was clogged up. 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.
Gm part number 12642623. Replacing the fuel filter head on the 2007 classic lbz duramax. Dealer also says that he has had a lot of the same trucks in for the same thing.
I have a 2500hd with a duramax lmm new body style.
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