Bubba1987 Posted January 31 Share Posted January 31 I just bought a 2015 Mack CHU613 with the MP8. Has 480,000 miles on it. It’s hard to start after it sits for a while. If I pump fuel manually it starts right up. Like it’s loosing its prime somewhere. Is there some things I can replace before redoing the injector cups? Quote Link to comment https://www.bigmacktrucks.com/topic/73814-hard-starting/ Share on other sites More sharing options...
MACKS Posted January 31 Share Posted January 31 Check all the return lines.. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73814-hard-starting/#findComment-545899 Share on other sites More sharing options...
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