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Old 02-14-2016, 06:06 PM   #1
Join Date: Mar 2012
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Angry Fuel rail leak, messy situtation

Stopped at a traffic signal on a busy street in S. California, a fellow traveler called my attention to a fuel leak at the rear of my 2006 Monaco Diplomat. I pulled over when I had a chance to observe the leak. It was pouring out on the curb side of the engine. Fuel had splattered all over of the engine, rock guard flap and covered the front of the toad. I contacted a trucking center that repairs their own trucks but not for hire on public vehicles. However, the gentleman that owned the shop told me of a mobile service company that could help. The company is and is national in all lower 48 states. I found a mobile service company for the area where I was broke down and gave them a call. A mobile service truck arrived within 45 minutes after my call.
The technician was very familiar with the Cummins ISL 8.9 and popped the cover over the dog house inside the unit under the bed and found that a fuel rail (high side) was leaking under pressure. He removed it and found pitting on the chamfered fitting of the rail where it screws into a nipple that connects to the intake. He inspected the rail and found no leak but believed that the pitting was the problem. After using a brass wire brush which polished the surface and removed the rough spots he reinstalled it and we started the engine. It was all buttoned up with no leakage what so ever. At first I thought the fitting was not tight on the nipple when he tried to remove it but it was very secure requiring two hands on the end wrench to back off the fuel rail fitting. He said that it was probably caused by water in the fuel and suggested that the fuel separator be used more frequently to remove moisture. My plans now that I'm home is to first clean up all the residue mess around the engine, frame and etc. Then remove all remaining fuel rails, inspect and/or replace or perform the same service. Just a heads up for all of you out there. I strongly suggest this mobile service by The repair required labor only and I got away with paying only $148.75 for their service. Just a heads up for all of you out there.
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Old 02-14-2016, 07:21 PM   #2
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Wow, what service, and a good price$
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Old 02-14-2016, 07:32 PM   #3
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Great tip, thanks for sharing. It looks like they may have an app. but not sure if it's the same.
Chuck in SW FL
Digital 2021 Cornerstone "B"
A "Digital" 2019 Cornerstone "B" Traded
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Old 02-14-2016, 07:49 PM   #4
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Great lead and unbelievable service and cost. Glad it worked out for you.

Dave and Young
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Old 02-14-2016, 07:54 PM   #5
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Wow what a fantastic website. It went straight to my Bookmarks after registering. The accompaning also went there. Thanks for sharing.
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Old 02-14-2016, 09:10 PM   #6
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Wow lucky for you, that someone pointed the leak out and you got it fixed right away. That is how a lot of coaches burn up. Fuel can spray on to hot exhaust parts and while you are driving you don't notice it until too late. When you stop it just erupts into a huge fire.

That happened to a fellow I know and they had just enough time to grab their dog and get out.

It sounds like you got really good service.
Dennis & Marcie & Captain Hook The Jack Russell,aka PUP, 2006 Itasca 29R 2017 Equinox toad. RVM59
We came, we went, nothing broken, nothing bent!
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Old 02-14-2016, 10:18 PM   #7
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Dean B......There was a recall in 05-06 regarding the fuel rail. It wasn't about leaking, but about the support. It wasn't properly supported and could cause issues. You might want to look into that.
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
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Old 02-14-2016, 10:50 PM   #8
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We had just bought our 82 PA bringing it home after a check up.
Unfortunately it was the "Highway patrol" telling me to pull over.

I was in the left lane and he was riding the ditch and me, and yelling at me too pull over. I proceeded to cross over 3 lanes of traffic within 1/2 mile. He tells me I am leaking something out of the rear end so we proceeded to the rear an sure enough there was a stream of Gas running pretty fast. I had just filled the rear tank and I overfilled the tank by a lot.

I had to get under the rear end and it was the overfill tube it was coming out of, almost like a garden hose stream.

The tube was about the size of my forefinger so I stuck my finger in and it stopped. So know what??, I told the other half to go in the MH and get me a 1157 bulb, sure enough if fit tight and I broke the bulb pushing it in and it stopped the leak.
The Highway proceeds too give me the third degree about everything under the sun, I was able to finally prove too him I had just bought it a couple days ago he said I'll release the both of you.
I now know not to fill past the first shut shutoff.

It just reminded me of what had happen to us.
Hope you have a safe trip and enjoy your MH,

1982 Pace Arrow P30 454
KarKaddy SS, Toad: 2009 Genesis
Tim, Joe and Lilly too. Mpls Minn.
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Old 02-15-2016, 03:42 PM   #9
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Good that you pulled over quickly. Diesel on pavement is extremely dangerous for those following behind.
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Old 02-15-2016, 08:21 PM   #10
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Dean B

This would be good information to put on
2008 Thor, Four Winds Mandalay 40G. Cummins 400 isl. Freightliner chassis
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Old 02-17-2016, 07:37 PM   #11
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Statistically, about 70% of RV fires originate in the engine compartment. Roughly 20% of RV fires originate with tires or brakes.
Source: RV Fire Safety – Vogel Talks RVing
That driver may have saved your families lives.

The high pressure line on the left bank of my Duramax developed a leak. The Chevrolet dealer tried to tell me it was caused by incompatibility of biodiesel with the sealing ring in the connections. Strange, I've driven my truck about 70K miles since then(141K total) and the right side has never leaked. IMO the connection was faulty from the factory.
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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fuel, leak

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