MikeD Posted February 12, 2020 Share Posted February 12, 2020 Mack MP8. I had this issue one weekend, on a Saturday. She’d start then immediately shut off or die. I put new batteries in because they were week. I cleaned connections on cables inside battery box. Not sure if I did it by bumping something during removal or tear down but positive push button breaker was kicked. I reset it while finishing up battery replacement. I don’t know why but I always check it when I’m in there. It started right up. started and ran no problem. I got home Wednesday afternoon. Got up early Thursday morning. She started the starting then shutting down within seconds again. This is were she’s been for a few weeks. I had a fuel line seeping. Fixed that. I changed the fuel check valve or pressure relief valve on the head. still doing same thing. I tried checking ecm, and module wiring. I tried a test ecm. I am leaning toward electrical but I am at my whits end. any help would be appreciated. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/60964-08-mack-cxu613-engine-start-and-then-shuts-off-within-seconds/ Share on other sites More sharing options...
MikeD Posted February 12, 2020 Author Share Posted February 12, 2020 Oh. And it does the same thing on either. Quote Link to comment https://www.bigmacktrucks.com/topic/60964-08-mack-cxu613-engine-start-and-then-shuts-off-within-seconds/#findComment-442581 Share on other sites More sharing options...
Mack Technician Posted February 12, 2020 Share Posted February 12, 2020 No active codes then may be injector cups. Quote Link to comment https://www.bigmacktrucks.com/topic/60964-08-mack-cxu613-engine-start-and-then-shuts-off-within-seconds/#findComment-442591 Share on other sites More sharing options...
MikeD Posted February 12, 2020 Author Share Posted February 12, 2020 No codes. Not losing prime like when cups have gone before. Quote Link to comment https://www.bigmacktrucks.com/topic/60964-08-mack-cxu613-engine-start-and-then-shuts-off-within-seconds/#findComment-442592 Share on other sites More sharing options...
MikeD Posted February 26, 2020 Author Share Posted February 26, 2020 No other ideas? Quote Link to comment https://www.bigmacktrucks.com/topic/60964-08-mack-cxu613-engine-start-and-then-shuts-off-within-seconds/#findComment-443747 Share on other sites More sharing options...
dirtys diesel Posted August 8, 2023 Share Posted August 8, 2023 have u checked ur fuel filters Quote Link to comment https://www.bigmacktrucks.com/topic/60964-08-mack-cxu613-engine-start-and-then-shuts-off-within-seconds/#findComment-536604 Share on other sites More sharing options...
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