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Re: Isuzu NPR Question
Posted to HD/Fleet Forum on 2/22/2019

I I remember right, I usually see fuel pressure in the high 4000s when the trucks are idling. Probably 4800-4900psi. It sounds like it does have low fuel pressure. Check to make sure there are no leaks in the system. I had one come in with low fuel pressure th... Login to read more.