All original as far as I know from 1996. No leaks. Any ideas if I should be concerned? Coach was in Colorado summer and Tucson winter, pretty much NO rust anywhere. Any costs idea if and when I have them replaced?
Thanks
This subject has been exhaustively discussed many times on this Forum.
For general questions of this sort, might I suggest that you first try the Forum Search function? It is a powerful tool.
Simply enter "fuel line replacement" in the box. To see the most recent threads, set "Search Order" to: Most recent topics first. When I just did this I got 8 pages of hits. Reading prior threads will most likely answer your question, plus you will learn a lot about your coach fuel system.
https://www.foreforums.com/index.php?action=search
I'm sure there is differing opinions, but my coach is a 99 and fuel lines are in good condition. I will wait until they need replacing.
I agree with Jerry (Reply #2)
However I just had all my fuel lines replaced last summer at MoT. My generator fuel line definitely had an air leak. Since the fuel tank would have to be partially pulled out to replace the generator fuel line, I decided to have all fuel lines replaced at that time. The total price was about two coach bucks ($2,000).
As it turned out, there was a splice in the generator fuel line that had been made by the previous owner. I had not known of the splice which was way up above and behind the front axle. I am pretty sure the air leak originated at the splice. All the removed lines appeared to be in decent shape.
I wish I had found the splice and saved myself two grand.
Richard
I had a similar situation with a splice and it was definitely the air source. PO used 3/8 hose and 5/16 fittings.
Richard,
Our 99' fuel lines were replaced in 2014 (about $2k at FOT). The generator fuel supply was the canary in the coal mine... the removed fuel lines looked to be in good shape. That is, until you took a really close look with a magnifying instrument of some kind. When bending it in a small radius, I could see microscopic cracks wherever I looked. I think the only way to be sure would be to put a vacuum on the line and see how well it holds. Just not worth the hassle to have the air leaks get bad when you are either not in a place to get the work done. As you no doubt know, aged out fuel lines on the supply side will always let air in before you see fuel leaking out. This may seem counter intuitive to folks new to these coaches, but as all the high pressure happens after the fuel injection pump after which the fuel is contained in preformed steel tubing, it does make sense. Of course, sometimes the steel lines can rust or the sealing washers at the banjo bolts can start leaking, and that can be a deadly fire hazard. Fortunately, that does not seem to be a common issue, unlike the rubber hose used between tank and the lift pump.
Don
Like Don's our coach only was pulling air at the generator. After changing all my fuel lines, the cracks at the fittings were obvious and it was just a matter of time before the engine would suck air. Also after reading about the changes in diesel over the last 20 years I wanted lines to be compatible with current fuel. It is a DIY job if you have room and time. Not rocket science.
Jerry the ULSD fuel cracks rubber fuel lines. You have rubber fuel lines. Not if but when. If I parked downhill the engine lost prime and I had to use the Winn manual pump to get the motor to run. Full tank. Tank up hill. Not as noticeable.
Hopefully your damaged lines do not leave you stranded somewhere.
Plus replaced the leaking Winn. Round file equipment
Good stuff. It all works great, I'll pass this year.
When and if you choose to do it, search the forum.
My cost was several hundred bucks.
Not that hard if your tank is almost empty.