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Old 04-03-2011, 08:34 AM   #1
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Warning Code 278 following lift pump replacement

My lift pump was replaced due to a leak and now the dash warning light comes on within about a minute. The diagnostics code indicated is 278 which indicates lift pump circuit. The RV is a 2003 Monaco Camelot with a 350 Cummins ISC. Mileage is 39,599 miles. The replacement pump came from Cummins and was described as a "universal'" newer pump which fits my engine. We have checked everything we can think of and the RV has had filters changed and new fluids. I would like to avoid the Cummins shop if possible if there is something else we may due to troubleshoot.
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Old 04-04-2011, 10:39 AM   #2
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Not sure if this will help or you may already have this information. See tha attached:
Attached Files
File Type: pdf Fault code 278.pdf (35.7 KB, 2684 views)
File Type: pdf Fault code 278 more.pdf (110.0 KB, 1452 views)
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Old 04-04-2011, 07:54 PM   #3
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Quote:
Originally Posted by PandK View Post
Not sure if this will help or you may already have this information. See tha attached:
Thanks for the pdf files. After another round of checking the connections and incidentally finding a tool that had apparently fallen during the course of the install and lodged in the vicinity of the lift pump the warning light has gone out.
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Old 04-08-2011, 12:05 AM   #4
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Glad you were able to solve the problem with no cash to Cummins.

Thank you for closing out the story.
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1995 38' CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
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