Justin336 Posted July 8, 2022 Share Posted July 8, 2022 Mp8 starts ok and idles ok most of time. Sometimes you give it throttle and its perfect then the next second it seems like its starving for fuel. Runs very rough then will eventually die. Has new fuel pump and filters. Truck is deleted except EGR. Shows low fuel pressure via laptop. At times it reads 0PSI but is still running. Any help would be appreciated. Quote Link to comment https://www.bigmacktrucks.com/topic/70074-2015-mp8-runs-rough-when-accelerating-and-will-eventually-die/ Share on other sites More sharing options...
Onyx610 Posted July 8, 2022 Share Posted July 8, 2022 COULD be overflow valve, fuel filter stand, or cups….also a few other things. Too much with these engines. Quote Link to comment https://www.bigmacktrucks.com/topic/70074-2015-mp8-runs-rough-when-accelerating-and-will-eventually-die/#findComment-502422 Share on other sites More sharing options...
Mackpro Posted July 9, 2022 Share Posted July 9, 2022 Check the banjo fitting in fuel line that goes from the Engine ECM cooler plate to the the filter stand . Trash gets pulled through the fuel lines , through the Engine ECM cooler plate then lodges in the banjo fitting at the fuel filter stand. Be sure to look inside the fuel line itself. Being a 2015 it should have quick disconnect fittings on the fuel lines on the Engine ECM. Earlier MP’s had banjo fittings on the cooler plate that would also clog. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70074-2015-mp8-runs-rough-when-accelerating-and-will-eventually-die/#findComment-502462 Share on other sites More sharing options...
fjh Posted July 9, 2022 Share Posted July 9, 2022 17 hours ago, Justin336 said: Mp8 starts ok and idles ok most of time. Sometimes you give it throttle and its perfect then the next second it seems like its starving for fuel. Runs very rough then will eventually die. Has new fuel pump and filters. Truck is deleted except EGR. Shows low fuel pressure via laptop. At times it reads 0PSI but is still running. Any help would be appreciated. is the check engine light coming on? Quote Link to comment https://www.bigmacktrucks.com/topic/70074-2015-mp8-runs-rough-when-accelerating-and-will-eventually-die/#findComment-502495 Share on other sites More sharing options...
Justin336 Posted August 1, 2022 Author Share Posted August 1, 2022 Only light that comes on is the fuel filter restriction. Drove truck for a solid three days without a issue then under a hard pull it started same issue. Replaced injector cups as well as the overflow valve in front of the head. Ran great for a few hours now same ordeal all over again. Quote Link to comment https://www.bigmacktrucks.com/topic/70074-2015-mp8-runs-rough-when-accelerating-and-will-eventually-die/#findComment-505058 Share on other sites More sharing options...
Adkat Posted August 1, 2022 Share Posted August 1, 2022 Sounds like a blocked fuel line, like mackpro said, check banjo fittings. They're a PITA for causing fuel blockages. Also any elbows in the system are good at catching debris and blocking. Pull the pick up and inspect, check tank too, have seen all sorts of rubbish floating in tanks that block the pick up randomly. Blow air back through all lines before reconnecting. Not sure if it's got nylon or rubber fuel hose, but seen plenty of rubber lines come apart inside, little flap of rubber acts like a shut off tap when on a pull. Anyway good luck. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70074-2015-mp8-runs-rough-when-accelerating-and-will-eventually-die/#findComment-505080 Share on other sites More sharing options...
steeler Posted August 2, 2022 Share Posted August 2, 2022 I'd bet my next paycheck on junk in a banjo fitting. I see it on a regular basis. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70074-2015-mp8-runs-rough-when-accelerating-and-will-eventually-die/#findComment-505109 Share on other sites More sharing options...
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