RDKSPKRV

Failed Fuel Line Cummins 380 Diesel

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RDKSPKRV   

Stopped at dealer this past Friday to have window shades repaired. Upon exiting the coach noticed diesel running down the side of the engine and under the coach.  This was on a Tiffin Phaeton that I bought new and was 1 yr old on July 28, only 8,000 miles.

Turned out to be a crack in the fuel line.   Fortunately, the Cummins center in Kenner, LA has the part but that required a 180 mile round trip.

Borrowed brother in laws car and got the part to the dealer before closing,. 30 minutes later we were on the road.

Understand this may be a common failure with this engine......any others experiencing this problem.   BTW the new fuel line had brackets on it to limit vibration... Appears Cummins knows it's a problem.  Seems like they should do a recall on this.   Not a safe situation!

 

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Welcome to the forum. It would appear the adding of the brackets is the fix. With the line stabilized it shouldn't crack again. Where was the crack?

Bill

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Wow, that happened on my 1995 Cummins engine.  The fuel line just split lengthwise.  It was the #6 line and when they tried to get that line it kept coming back with all 6 lines.  There was an undeclared recall and if one line went they were to replace all lines.  This happened to have happened on our way out of an FMCA Perry rally (our first) while headed to a Freightliner rally in GA.  It blew along the way and we limped up the hills on 5 cylinders with instructions from Cummins on how to do so.  They took REALLY good care of us at the rally!

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Just last week we returned from a short trip to The Big South Fork National Recreation Area. As we pulled into our subdivision I noticed smoke and diesel spray near the engine compartment. Our tow car was covered in diesel. After getting the Motor home to the Freightliner dealership in Nashville, it turned out to be a broken fuel injector line. We have close to 6,000 miles and bought this 2016 Newmar Ventana new last November. Just today I learned that this problem with Cummins is a regular occurrence. Fortunately the warranty covered towing and repairs.

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We just purchased a new 2017 Dutchstar and got it home and tried to start the engine and after 9 hours and a diesel mechanic later, find out it needs the same correction!  The part is in but Cummins and Freightliner said another week to two because their mechanics are laid up?  We have had our coach 2 months and never been able to enjoy it!  Not a fun way to start RV'ing   (Especially after spending so much money!). We had plans to use it for Christmas and took time off work and all the plans are futile.   I have written Newmar the dealership, Freightliner and Cummins .   Wish we wouldn't have bought a Newmar! 

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jleamont   

This seems to be a problem with other engine manufactures also. I just had a freightliner Tractor yesterday with a Detroit engine do the same thing, it was shooting fuel onto the turbocharger, no fire just a bunch of smoke from the fuel burning off.

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jleamont   
21 minutes ago, Hermanmullins said:

Do you think these failures are due to too much Bio-Diesel? Causing seal and hose disintegration.

No, the lines that are failing are metal. I have seen them crack, almost as if the metal composition was wrong for the application i.e. hardened to the point that it shatters or cracks like glass. Given the amount of PSI in todays diesel engines (some into 40,000 psi) running through them, the lines are stressed beyond what their metal can handle, toss some vibration into that and they fail, we wont get into what country they were probably sourced from also doesn't help matters......

  

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jleamont   

It looks like 3-4 years is as far back for this issue.... in general. The Detroit that failed yesterday was a 2018 unit with 4200 miles on it. Other issues began when the EPA shoved the emissions systems down everyone's throat. I have had injection pumps fail from the casting not being able to handle the PSI and it boaring a hole in them :o on a 2012 Cummins ISL and a 2007CAT C7S. With that kind of pressure spraying around an engine compartment you can do some serious bodily harm, its like a water jet CNC machine.

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Joe, You might take a look at this link.  Lines Available in SS or other materials

They can make about any tube for any make and model vehicle and engine. If they do not - sending them the tubing information and bending pattern / even an OEM line as a pattern and see what they say. They also make Brake lines and kits.

Classic tube Lancaster NY    1-800-882-3711

                http://www.classictube.com/index.php

Rich.

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Are we speaking of the individual lines from the pump to each cylinder?

I am not that familiar with the diesel fuel supply system. What might be the PSI from the injector into each cylinder? If it is close to 40,000 PSI could that erode tops of pistons and even cylinder walls? 

You can see by my questions I know ever little about Diesel Engines.

Herman

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jleamont   

The Cummins failures so far have been between the "rail" and injectors. This video explains how some Cummins systems operate.

 

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jleamont   
8 minutes ago, Hermanmullins said:

Joe, does this mean that all of the lines after the Hi pressure pump are subject to the reported line failure?

Herman

It seems like the longer ones fail more frequently. Speculation; vibration due to the length? I have seen one fail after the pump before the rail but it looked like it was bumped during engine installation or while working on something else. When I say bumped, it had a dirt mark, no bend or scratch on the paint.

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jleamont   
9 minutes ago, Hermanmullins said:

Thanks, learned more each day and hope to continue learning.

Herman

You're welcome, Anytime buddy!

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