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Old 09-26-2015, 11:40 AM   #1
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Diesel won't Restart

My Cummins ISC in our 2003 Dutch Star started and ran fine the other day. I had a small fuel leak but had the lift pump looked at and was told it was only a little loose so they tightened it up. No problem since then until today. Started it up and it ran for a few minutes and then shut down. It did this back before I had the lift pump looked at and was then told about tightening it up. Seemed to fix the issue. Always before it would restart after about 5 minutes and run fine. Now it won't start at all.

Can anyone suggest what might be the problem now.
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Old 09-26-2015, 11:42 AM   #2
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Loose again?
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Old 09-26-2015, 11:46 AM   #3
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May be Gary, it is dripping a small amount again.
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Old 09-26-2015, 12:36 PM   #4
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I let the lift pump run for over a minute until it shut off. Then tried starting it and it did start and run. No leaks while it is idling but once I turned it off it dripped some. I think the lift pump and/or gasket/seals are bad from re-tightening it a few weeks ago.
Plan is to have a diesel shop look at it Monday.
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Old 09-27-2015, 04:21 AM   #5
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Your sucking air. Take the lift pump off and reinspect and replace if necessary (look for algae and any crap) and use a new gasket. Good Luck
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Old 09-27-2015, 05:09 AM   #6
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You will not get it restarted in that condition. If it's leaking then it's also sucking air as mentioned above. You risk the chance of doing more damage like maybe burning out starter by continuously turning starter over. Good luck.
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Old 10-01-2015, 05:57 PM   #7
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Got it back from the shop today. They replaced the lift pump and now it starts and runs smooth. Had to have it towed there as it would not start again. In order to get to the lift pump the muffler/exhaust had to be removed. Total of 3 hrs. labor + the part. Even at that I am a happy camper.
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Old 10-02-2015, 11:53 AM   #8
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I'm assuming your Cummins has the CAPS, fuel system, there have been a number of threads about leaks from the gasket ; between the lift pump and the manifold it mounts to; there was some mention of the original equipment gasket, being effected by ULS ( Ultra Low Sulfur ) diesel, and shrinking , causing the leak. Hopefully the replacement gasket is a long term fix.
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