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Re: 07 GMC 3500 Duramax fuel pump location?
Posted to HD/Fleet Forum on 6/12/2018

There is a lift pump on the back of the CP3 pump and it’s mechanical. There it a hand pump on the fuel/water separator housing as well as a air bleed. This system pulls the from the tank under vacuum all the way to the transfer pump. You cannot have any vacuum... Login to read more.