jake15 Posted June 21, 2009 Share Posted June 21, 2009 i have a 1974 mack single axle rd model. this truck has a scania motor . i have had this truck for 20 years and it has always been very reliable. for the past two years i have had a problem with the truck shutting off on me. when it shuts off the fuel filters will be nearly empty . if i crack a injector line and pump the hand primer for a while it will eventually start and run . it may shut down again in 10 minutes or it may not do it again all day. it will do this both running or at a idle. this truck has 2 tanks , where should i start . i have heard from friends (not mechanics) to look for a tank blockage, the equilizer valve ? a return problem or even the pump . when the truck is running it runs just fine . any ideas would be greatly appreciated. thanks Quote Link to comment Share on other sites More sharing options...
HK Trucking Posted June 21, 2009 Share Posted June 21, 2009 I suspect an intermittent leak somewhere on the suction side of the system, allowing the transfer pump to suck air instead of fuel. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment Share on other sites More sharing options...
Bollweevil Posted June 21, 2009 Share Posted June 21, 2009 First make sure the fuel tank vents are open. Then drain the primary filter into a container, and look for a black, grainy substance, similar to fine sand. Sometime with age a rubber lined fuel line will come apart. Part of the line will separate and act like a flap, closing the fuel line under suction. You could disconnect the line at the primary filter, substitute a known good line and run the engine from a fuel can. Quote Link to comment Share on other sites More sharing options...
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