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I’m glad this short write up has helped over the years.

Single supply and 2 from the tank with no returns? Must be for a gasser,all multis with dual tanks had a transfer pump and the Macks had the same as the 800 series.

Well,After searching the threads and getting questions from other members,I decided to cover the cleaning /rebuild of the fuel tank selector valve used on the M39,M800 and possibly M900 series 5 tons. First off,this valve is a common air leak in the fuel system on the 800 series trucks with...