maique Posted December 15, 2007 Share Posted December 15, 2007 hi does anyone have a fuel diagram for a 1974 mack 685 dm my truck empties the drivers side first then acts like its out of fuel mean while the passenger side has fuel i was wondering if anyone has a diagram of how they need to be plumbed so that doesnt happen thanks Quote Link to comment Share on other sites More sharing options...
HK Trucking Posted December 15, 2007 Share Posted December 15, 2007 hi does anyone have a fuel diagram for a 1974 mack 685 dm my truck empties the drivers side first then acts like its out of fuel mean while the passenger side has fuel i was wondering if anyone has a diagram of how they need to be plumbed so that doesnt happen thanksOn a 75 DM with 2 tanks, there is (or should be) a crossover line running from the lower front of one tank to the lower front side of the other tank.The suction and return lines for the engine are on the driver's side tank.If it empties the driver's side tank and the pass. side tank stays full, then one or both of the shutoff valves (located where the crossover line hooks to each tank) are closed, or there is a blockage in the crossover line or fittings. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment Share on other sites More sharing options...
b61mack Posted December 16, 2007 Share Posted December 16, 2007 hi does anyone have a fuel diagram for a 1974 mack 685 dm my truck empties the drivers side first then acts like its out of fuel mean while the passenger side has fuel i was wondering if anyone has a diagram of how they need to be plumbed so that doesnt happen thanksthere could be a pluged vent on top of the tank. Quote Link to comment Share on other sites More sharing options...
maique Posted December 16, 2007 Author Share Posted December 16, 2007 there could be a pluged vent on top of the tank.ill go and check it out thanks Quote Link to comment Share on other sites More sharing options...
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