petehenry Posted August 9, 2014 Share Posted August 9, 2014 we have 01 mr688s that randomly starts cutting out at all speeds than u shut it off for 5 min and after ghat runs fine. we had it to dealer and they replaced #6 unipump because off broken spring an test drove everything work great so they say it fixed but next day back ta same prob so i put a gauge on the fuel line an the pressure jumps all over the place from 55-85 psi but its never steady at any speed. any ideas? Quote Link to comment https://www.bigmacktrucks.com/topic/36635-help-e7-cutting-out-losing-power/ Share on other sites More sharing options...
bts-4120 Posted August 9, 2014 Share Posted August 9, 2014 supply pump? Quote Link to comment https://www.bigmacktrucks.com/topic/36635-help-e7-cutting-out-losing-power/#findComment-255570 Share on other sites More sharing options...
petehenry Posted August 10, 2014 Author Share Posted August 10, 2014 But why would shutting it off for 5 min fix it for the day? Than maybe next day it would run fine all day long. Quote Link to comment https://www.bigmacktrucks.com/topic/36635-help-e7-cutting-out-losing-power/#findComment-255624 Share on other sites More sharing options...
Randy mckinney Posted August 15, 2014 Share Posted August 15, 2014 I had one do that too replaced fuel line from tank and problem fixed. Just an idea for ya. Quote Link to comment https://www.bigmacktrucks.com/topic/36635-help-e7-cutting-out-losing-power/#findComment-256050 Share on other sites More sharing options...
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