cxn613 Posted February 3, 2015 Share Posted February 3, 2015 DM mack will start and run but after awhile it starts fluttering and shuts off and won't start. Have fuel when I push primer, but didn't seem to have fuel while cranking engine with supply line off pump. Guessing I have a supply issue but mack dealer says there not available anymore. Anybody else have or had this issue? Quote Link to comment https://www.bigmacktrucks.com/topic/38724-dm-wont-stay-running/ Share on other sites More sharing options...
gearhead204 Posted February 4, 2015 Share Posted February 4, 2015 I take it that when you say you have the supply line off the pump your talking about the line between the primer pump and injection pump? is the plunger on the primmer pump leaking when you activate it by hand? is the vent on the fuel tank plugged? Quote Link to comment https://www.bigmacktrucks.com/topic/38724-dm-wont-stay-running/#findComment-277317 Share on other sites More sharing options...
Rusty Bolts Posted February 4, 2015 Share Posted February 4, 2015 sound like winter big dog, might be filters or soft rubber fuel line, or something down in the tank being sucked up in the fuel tube, could be supply pump it self, when the truck shuts off how long before it starts back up, there are a lot of unknowing here like are you pulling fuel from both tanks or just one,like cross over line, fuel line rub , hope this is a little help Quote Link to comment https://www.bigmacktrucks.com/topic/38724-dm-wont-stay-running/#findComment-277343 Share on other sites More sharing options...
ranchhopper Posted February 4, 2015 Share Posted February 4, 2015 Sounds like the fuel filters are plugging up it will run on the fuel in the filters then die as it uses the fuel up after the truck shuts down the suction refills the filters and it will start again. Quote Link to comment https://www.bigmacktrucks.com/topic/38724-dm-wont-stay-running/#findComment-277357 Share on other sites More sharing options...
cxn613 Posted February 8, 2015 Author Share Posted February 8, 2015 Thanks for the replys. It was actually loose line from filter into primer pump sucking air. Quote Link to comment https://www.bigmacktrucks.com/topic/38724-dm-wont-stay-running/#findComment-277998 Share on other sites More sharing options...
j hancock Posted February 8, 2015 Share Posted February 8, 2015 Nothing better than an easy fix. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/38724-dm-wont-stay-running/#findComment-278022 Share on other sites More sharing options...
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