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Re: 2006 Duramax won't hold prime
Posted to HD/Fleet Forum on 4/5/2019 1 Reply

There is a one-way check valve inside of the fuel filter housing. It sounds like the check valve may be leaking. You can try to remove the hose from the outlet of the filter housing and attach your pressure gauge. Once primed to 10 psi, the pressure should hol... Login to read more.

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