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Old 09-06-2022, 03:15 PM   #1
james schaechter
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Default Re: Cummins 5.9 12 valve mechanical expert

I agree regarding filters. It can be some bad fuel plugging things up as well. It may be more of an 8.3 liter Cummins thing, but I did have issues with the fuel shutoff solenoid. The solenoid was fluttering and basically shutting the fuel pump on then off. An easy test is to disable it and try it again.
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Old 09-07-2022, 02:30 PM   #2
Barry Polley
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Default Re: Cummins 5.9 12 valve mechanical expert

Filters filters.. hopefully not the lift pump. If by chance you put fuel in mixed with biofuel there is a very good chance you knocked some debris loose for your filters. Bio is an extreme detergent and older vehicles hate it. If you have a algae issue ( starts at the refinery tanks) you will need to dump tanks and clean them. Very hard to get rid of. I haven’t seen an additive for it. Hopefully you just took on a bad batch of fuel. We changed 2 filters from Salt Lake to Bay Area with bad fuel once. We had to leave the diagnostic tool plugged in and clear under way.
Hope you get it worked out.
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Old 09-08-2022, 01:08 PM   #3
rseibenick
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Default Re: Cummins 5.9 12 valve mechanical expert

Thanks guys for all of the information. Will let everyone know what I find out.
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Old 09-14-2022, 07:43 PM   #4
Ralph A Powell
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Default Re: Cummins 5.9 12 valve mechanical expert

Do you have a boost gauge? If the boost is down first thing to check is fuel filter. On one trip I drove all night with very low boost checked turbo hose for damage could find any thing. We stop for fuel in early am was looking at engine attendant come up and ask what we were doing told him about our problem with lack of boost. He told us to change filter luckily I alway card a couple. I changed it and were started out and instantly we had full boost.
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Old 10-12-2022, 12:29 PM   #5
rseibenick
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Default Re: Cummins 5.9 12 valve mechanical expert

Changed both filters . Both were black . Put a fuel pressure gauge on it . Took it out for a test. Cut them, open ad small black dots in the At 2000 had 28 PSI , when I got on it the pressure dropped to 15 . When I got off it cam e back up to 28. Now changing the overflow valve ,and see it that solves it. IF not, then the lift pump. Any other ideas. Thanks.
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