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Old 06-26-2016, 02:09 PM   #1
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Help, Fuel Leak Cummins 400isc

Hello,

I am new to owning a motorhome. We were preparing to go out for an extended vacation when my husband found what looks like a leak. We purchased this 2004 Monaco Dynasty last July and have used it several times for fairly short trips. Now we are planning several hundred miles. The leak appears to be between the #5 or #6 injector. Fuel must be leaking down towards the starter because we see the oily residue. The engine performance has not had any problems running down the road. He did this visual inspection while checking out the coach for our trip, now not sure what to do. Please see attached picture. How dangerous is this? Most RV repair places are 25-50 miles away. Am I able to drive the coach? I'm not sure if a mobile repair mechanic could replace the item. The cummins dealer is 50 miles away. Any tips, suggestions would be greatly appreciated. Husband is pretty mechanically inclined,he's replaced the fuel/ oil filters and air cleaner, but this is too advanced for him.
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Old 06-26-2016, 02:39 PM   #2
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It could be a lose fitting where the line connects to the injector or a cracked line. I had one that leaked at idle and when revved up it did not leak. After driving it several miles it quit leaking. I did have one of the lines crack and start to leak. I just removed it an replaced it. Some of them you can carefully try tightening them. Some have a o ring in them that fails.
If it is only a slight drip you could probably drive it to a shop for repair. If it is dripping fairly bad I would not drive it like that for fear of a fire.
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Old 06-26-2016, 03:41 PM   #3
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Quote:
Originally Posted by kdem950 View Post
Hello,



I am new to owning a motorhome. We were preparing to go out for an extended vacation when my husband found what looks like a leak. We purchased this 2004 Monaco Dynasty last July and have used it several times for fairly short trips. Now we are planning several hundred miles. The leak appears to be between the #5 or #6 injector. Fuel must be leaking down towards the starter because we see the oily residue. The engine performance has not had any problems running down the road. He did this visual inspection while checking out the coach for our trip, now not sure what to do. Please see attached picture. How dangerous is this? Most RV repair places are 25-50 miles away. Am I able to drive the coach? I'm not sure if a mobile repair mechanic could replace the item. The cummins dealer is 50 miles away. Any tips, suggestions would be greatly appreciated. Husband is pretty mechanically inclined,he's replaced the fuel/ oil filters and air cleaner, but this is too advanced for him.

You actually have a Cummins ISL. I think there may be a recall on a fuel line problem on this engine. I would call the closest Cummins dealer with your engine serial number and ask about that. I certainly would not run the engine if the leak is spraying out on the exhaust side of the engine but probably not good in any case. Your roadside assistance might tow you.
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Old 06-26-2016, 03:57 PM   #4
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If you think it's driveable, I believe any diesel repair shop could handle this vs. going to an RV or Cummins place. I just had mine serviced at a nearby diesel shop and he found and replaced a piece of fuel line with a small leak.
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