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Old 09-04-2023, 02:29 PM   #1
richard2717
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Join Date: Oct 2011
Location: Eastern Shore of MD
Posts: 9,897
5.9 cummings 12v question

guys
I have a 96 5.9 12 valve in a ferd work truck. Truck has sat since beginning of 2020 but ran and drove great when I set it up. It had been started and drove around the yard at least once a month since. I needed it the other day on a job a couple miles from the shop so I fired it up and away we went. Engine idles fine and revs up fine with no load but going thru the gears seems to lose all power and the most I could get out of it was about 25 mph which was still a struggle. Never once tried to shut off just has no power. Drove it back to the shop with same conditions happening. Any ideas what I should be looking for? would the fuel be going bad? Going over it smoked black smoke like crazy coming back was not as bad but you could definitely smell the raw fuel.

Thanks
Richard
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