Cummins 2005 ISL low power AGAIN!
What we thought was a sticking exhaust brake on our MH is now a, They don't know. The exhaust brake checked out good and functioning properly. $515.67 later and Cummins West thinks it could be a faul...
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My 2006 ISL 300 HP Cummins lost power, and what it turned out to be is the low pressure fuel pump. Prior to that there was no power and lots of black smoke. Replaced the pump and now 50 lbs of boost
