Foretravel Owners' Forum For owners and Fans of Foretravel Motorcoaches September 09, 2025 ...

Picture of my new fuel line that Bern'd replaced.

Pierce..so you leave the sheating in place after the "pull"?
Hans

One more thing to ponder, is push on fittings vs crimped.  With the amount of flow that big M11 diesel uses, can a push on barbed fitting stand up to that, and with no clamp? If I did use a clamp, I agree that the solid european ones look a lot better so will use them.
Will save a bunch of money using the push on's as well vs crimped or aeroquip.  Calling around in the monring to check prices locally vs internet.
Thanks,
Bob

From Bob and Julie" "One more thing to ponder, is push on fittings vs crimped.  With the amount of flow that big M11 diesel uses, can a push on barbed fitting stand up to that, and with no clamp? If I did use a clamp, I agree that the solid european ones look a lot better so will use them.
Will save a bunch of money using the push on's as well vs crimped or aeroquip."

Parker/Aeorquip or Gates all spec the fittings for each particular hose.  I would only use what fittings are recommended by hose mfg for that particular model hose.  You will find excellent information online, and can verify that with your hose shop.

No problem with hose on slip on barbs coming off.  Never use a hose clamp on a barbed fitting and hose,  A hose clamp used on a barb will destroy the hose and leak.  The solid clamp should only be used on approved solid, not barbed, fittings.  Over torquing a hose clamp will and can cause a leak as over torquing a threaded fitting can also.  You might also note warning by hose fitting mfg's of problem caused by over torquing and mixing steel and brass threads.

I noticed on your generator the ES-52 controller looks to have been moved out of the control box.  Is that in the electric box at the bottom?  Or is that box for a plug-in to supply another coach or your house?

BTW the PO of my coach had FT change the fuel lines and the generator uses the Parker HTFL.

First of all, fuel hose is identified by the inside diameter or I.D. Most diesels have a fuel supply line running from the tank to a primary filter (sometimes lift pump), then to a engine powered lift/fuel pump and then to the secondary filter. From the secondary filter ( the one with the lowest micron rating/filters the smallest particles) the fuel travels to the injection pump or unit injectors in the case of the Detroit 2 cycle. The fuel may go through the engine's computer to cool it.

The only time there is pressure in the fuel supply line is after the lift pump. It's about 35 to 50 psi on ours. The rest of the time, it's sucking from the fuel tank. This is why some fuel lines may not require a hose clamp. The injection pump pressurizes the fuel to about 3000 psi in the earlier engines to 25K psi in the common rail late engines. But the engine does not use all of the fuel, in fact, only a small amount. The excess is used to cool the injectors and is returned to the fuel tank via the return hose. It can be quite hot so the temperature rating on the hose is important even though there is not much pressure on the way back. Since our fuel tanks are mounted out of the airstream, their temperature will be higher than a big rig so it's a good idea to keep the fuel level a little higher than you might normally do in your car. The injection pump has a temperature rating for the incoming fuel. Our U300's tank gets too hot to touch if it gets low. It's never bad practice to install a fuel cooler (much like a transmission cooler) in the return line to make sure the fuel is within specs for the injection pump.

Low pressure because of a air leak or filter restriction can cause the main injection pump to receive fuel at lower than normal pressure. At high engine output, the injection pump may not receive enough fuel to provide full power to the engine but also the pump may not be lubricated and cooled properly and may shorten it's life in some cases.  The return valve on the injection pump may be checked to make sure the internal supply pressure is within factory specification if you have a Bosch P injection pump. Rotary pumps also don't like low pressure either.

The M11 engine while 11 liters is small compared to many big rigs and even if getting 4 mpg at 50 mph on grades is actually burning less than a quart a minute at high output. The excess fuel the lift pump supplies just heads back to the tank. A spring loaded valve keeps a certain amount of pressure on the pump outlet side so the pump should always have the correct operating pressure. This is usually located just past the engine on the return line.

So, you can see that the fuel in the tank is constantly being recirculated and "polished" by the filters. In a well designed fuel system, any water/sediment/algae will be trapped in the bottom of the primary filter and if checked on a regular basis, should give an early indication of contamination. The bottom of the primary filter may have a plastic see through part and or a water sensor that will indicate if water is present.

It's possible that some models may have tank mounted fuel supply pump. Ours does not.

Some CATs don't have a fuel return line.

Pierce

OK, found a supplier that has it in stock, and is close by,  5/8" 8 bucks per foot and 3/8" 4.72 per foot. in stock, don't have to buy a entire store's worth.  Parker 201 transportation hosein blue and black. Fittings extra.....

Thanks for that post Pierce, was some of the info I was looking for.
Went to 2 hose supply companies in town today, Hufco and Hose of South Texas. Hose had nothing good, but would order some at 350 feet per roll. I would have to buy the entire roll........ ah no thanks. The other hose was pretty lame Parker  7212  at 1.40$ per foot. A great price for a so so hose.
Hufco had Parker 201 hose, great stuff, at only $8.28 per foot plus tax, plus fittings, but they couldn't get me the required length. I would have to order a big roll....
So I am thinking that the Trident A1 marine hose is looking pretty good right about now. Trident 365
The only issue I see is there are no fittings for this that I can find other than push on barb type fittings. For the aqua hot, the generator I see no issue. With the Cummins, there might be. Might not. Will have to change out fittings on the fuel filters and engine. But might just order the Parker 201 from the filter to the engine. Easy to monitor the fuel filter/water separator near the start batteries.  If I did go with the Parker 201, that would be 510$ just for the hose, fittings extra.  Thinking of going with that though, IF they can get it in one continuous piece.

Try to find a roll. Will be much cheaper.

P

Sorry if I offended you.
I looked at the hose, it's not what I would put on this kind of engine. Might be ok for smaller diesel engine, or the genset imo.
HOSE COVER MATERIAL Chloroprene
APPLICATION Air & Multipurpose
MEDIA Various
MAXIMUM WORKING PRESSURE (MPA) 2.1
WEIGHT (KG/M) 0.01 to 0.04
WEIGHT (LBS/FT) 0.09 to 0.30
VACUUM RATING (INCH OF HG) 15 to 28
VACUUM RATING (MM OF HG) 381 to 711
HOSE I.D. (SIZE) -4 to -12
HOSE I.D. (DN) 8 to 20
INDUSTRY STANDARDS MSHA
HOSE INNER TUBE MATERIAL Black nitrile
MATERIAL - HOSE REINFORCEMENT One textile braid
FINISH - COVER Smooth
COLOR Black, Blue, Green, Gray, Red, Yellow
MINIMUM WORKING TEMPERATURE (F) -40
MAXIMUM WORKING TEMPERATURE (F) 212

it has one textile braid only. Not much in the way of protection. No inner lining. Already have to spend money to fix a stupid mistake a previous owner allowed to happen on his now my coach, don't want to make a similar mistake.
If it works for you, then fine.
It's not made specifically for diesel applications. It's a multipurpose hose, same as I have now, which is failing. Not sure how you would know if the hose is "working for you" but if it is, great.  I suggest you take a rag to it sometime and see if the smell of diesel is permeating it. I suspect that after a while it might. Might not. I only want to do this once.

No offense taken. Just people ask questions, and you try to help, but they don't do the research.
All is well in my world. If it's good enough for Ethanol, it's good enough for acid. Like I said, many miles and months, and it's fine. No smell. But if you want to throw good money away send it to me please.....LOL...I'am an unemployed ,panhandler, drag racer.
Chris