Commons 6 Duramax Problems & Concerns It can also be relatively difficult to prime the fuel system once air has been introduced into the system, such as when the fuel filter is changed. The 2001 to 2004 LB7 fuel filter housings seem to be the most prone to problems. Water Pump Failure. Water pump failures for Duramax Duramax LLY · Duramax LML · Duramax LMM · Duramax LB7 · Duramax LBZ DIY Duramax Fuel Fix: Rebuilding A Leaky Fuel Filter Head A common problem with high-mileage 2001-2010 Duramax trucks is that the fuel filter head assembly begins to develop air leaks. The engine’s 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.
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