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International Automotive Technicians Network
Re: 2001 GMC 3500 with 350 engine
Posted to HD/Fleet Forum on 2/11/2024

Do a BG fluid flush kit on it first.

Pull the return hose blow air into the reservoir ( cap off pump all fluid sucked out) there's a screen in there that can plug.

Lines fail more often than you might think return lines draw air into the pump pressure line... Login to read more.