Big Shop Daddy Posted August 31, 2015 Share Posted August 31, 2015 09 MP-7 MR that runs fine during the day IF you don;t shut it off?. ZIf you shut it off after running it about 2 hours it will lose Prime? It runs great while its running. No problem during stops. no hiccups nothing until you shut it off? what do you think? Quote Link to comment https://www.bigmacktrucks.com/topic/41584-mp7-its-loosing-prime/ Share on other sites More sharing options...
220cummins Posted August 31, 2015 Share Posted August 31, 2015 Loose fitting fuel filter? Cracked filter base? Quote Link to comment https://www.bigmacktrucks.com/topic/41584-mp7-its-loosing-prime/#findComment-302155 Share on other sites More sharing options...
j hancock Posted August 31, 2015 Share Posted August 31, 2015 Faulty check valve on fuel return line? Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/41584-mp7-its-loosing-prime/#findComment-302157 Share on other sites More sharing options...
41chevy Posted September 1, 2015 Share Posted September 1, 2015 Faulty check valve on fuel return line?ditto. Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/41584-mp7-its-loosing-prime/#findComment-302168 Share on other sites More sharing options...
wheeler73 Posted September 1, 2015 Share Posted September 1, 2015 Could also be burnt injector cups. Quote Link to comment https://www.bigmacktrucks.com/topic/41584-mp7-its-loosing-prime/#findComment-302196 Share on other sites More sharing options...
bbigrig Posted September 1, 2015 Share Posted September 1, 2015 Cups....and my understanding is that there is no stainless/connical upgrade for MP7's.??? Quote Link to comment https://www.bigmacktrucks.com/topic/41584-mp7-its-loosing-prime/#findComment-302241 Share on other sites More sharing options...
Challenger Posted September 1, 2015 Share Posted September 1, 2015 Cups....and my understanding is that there is no stainless/connical upgrade for MP7's.???No stainless cups for the '04 emissions MP7s. The engines without regen. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/41584-mp7-its-loosing-prime/#findComment-302271 Share on other sites More sharing options...
Macktech689 Posted September 7, 2015 Share Posted September 7, 2015 Faulty check valve on fuel return line?The backflow valve is located within the filter housing, the problem probably lies in the injectors or cups as stated before. Quote Link to comment https://www.bigmacktrucks.com/topic/41584-mp7-its-loosing-prime/#findComment-302908 Share on other sites More sharing options...
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