Old Fuel Lines

Topic: Old Fuel Lines (Read 3881 times) previous topic - next topic

Re: Old Fuel Lines

Reply #25 – January 19, 2013, 12:21:55 am

Here is the PDF for the fuel line. HTFL = high temperature fuel line, 8B= 1/2" OD, B= probably diesel. The PDF gives all the specs, including color, material, pressure rating, etc. It's about half way down the page.

Pierce

Re: Old Fuel Lines

Reply #26 – January 20, 2013, 04:31:47 pm

Kind of looks like swegded fittings. Anyone know if any easily installed fittings are available?

Note to self, Google first, ask questions second. Here are some field installable fittings. http://www.parker.com/literature/Brass%20Products/Bul.%20DF-01.pdf

Re: Old Fuel Lines

Reply #27 – January 20, 2013, 05:51:36 pm

I wasn't watching carefully when they installed the fittings. However, I think they were simple compression fittings. I think they cut the ends of the tube squarely, put on a hex fitting, put on a ring, plugged it together, and tightened the fitting. They did change all the fittings on the tank.

Re: Old Fuel Lines

Reply #28 – January 20, 2013, 09:09:30 pm

Looks like Parflex diesel tubing uses push to connect fittings. Gam

Re: Old Fuel Lines

Reply #29 – January 20, 2013, 10:32:37 pm

Hard getting info on the Parflex lines and fittings. I think the push to connect fittings use a hydraulic pusher. Some of the stuff uses the quick style field fittings, it's just not real clear which. Since the quick fittings seal under pressure I wonder how they would work on a suction line.

Sounds like the stuff they used on J.D.'s coach is some pretty primo fuel line. I'll bet fuel line restriction is greatly reduced using this stuff. Looks like they want to keep it out of the engine room so normally transitions to standard line in high heat areas.

Re: Old Fuel Lines

Reply #30 – January 20, 2013, 10:50:04 pm

A quick call to a Paraflex dealer can tell you if any tools are needed to install the fittings. I would not get off the phone until I had a good answer. Any hydraulic shop can also install fittings at a nominal cost.

The Detroit Diesel 2 cycles have all the engine fuel lines inside the cylinder head casting so the returning fuel is HOT. After a day's driving, I can't touch the fuel tank especially if the tank is low.

Pierce

Re: Old Fuel Lines

Reply #31 – January 21, 2013, 09:20:42 am

What I.D. are the fuel lines? Gam

Re: Old Fuel Lines

Reply #32 – January 21, 2013, 10:19:09 am

.376" inside diameter or 9.55mm

Pierce

Re: Old Fuel Lines

Reply #33 – January 21, 2013, 11:07:51 am

Parflex Division - Parker

Re: Old Fuel Lines

Reply #34 – January 21, 2013, 08:27:31 pm

Quote from: gam – January 21, 2013, 09:20:42 am

What I.D. are the fuel lines? Gam

The parts lists for our repair at FOT included 40' each of HTFL-6B, HTFL-8B, and HTFL-10B. I.D. were .251", .376", and .441" according to the Parker web site. Parker - HTFL SERIES.

Re: Old Fuel Lines

Reply #35 – January 29, 2013, 09:31:44 am

Pierce,
I went ahead and purchased 100' of the Parflex .5" line. When installing it, found that is is used for air systems also, marked on the line, says air service, does not say diesel fuel. Upon further detective snooping, I found the air line I have been using for diesel fuel for years is also rated for Diesel Fuel and much less cost. The Parlfex was $198.00 for the 100' roll. (Non stocked item)
Just fur your info.
Thanks again, we keep learning !
Dave M

Re: Old Fuel Lines

Reply #36 – January 29, 2013, 09:36:22 am

Dave,

What kind of end fittings did you use on the new line?

Re: Old Fuel Lines

Reply #37 – January 29, 2013, 09:44:08 am

The same as used on air lines, brass farrel with stainless insert.
Dave M

Re: Old Fuel Lines

Reply #38 – January 15, 2014, 12:50:43 pm

Getting ready to tackle this but I am wondering if someone who has completed this job can answer whether the fittings on top of the fuel tank are threaded female 1/2" for both main engine and return along with 3/8" for generator and return?

And is this job as easy as ordering a few of the 90deg Parker NTA fittings and running the new lines to the primary fuel filters on both engine and gen, other than the labor of course?

Re: Old Fuel Lines

Reply #39 – January 15, 2014, 03:50:20 pm

Can't tell you that but do know it took 1.5 days with three men. Looked at mine when I got here and they needed to be changed out.

Re: Old Fuel Lines

Reply #40 – February 20, 2014, 05:48:50 pm

Just to keep this information in one spot for anybody thinking about doing it themselves, all the ports on the top of the fuel tank for both supply and return are 1/2" NPT female connections with a 90 degree male NPT to flare fitting installed.

The supply for the Cummins has a 5/8" flare connection on it with the Aeroquip 2556-10 hose and all others are a 3/8" (flare 37 degrees) or -6AN flare fitting with Aeroquip 2556-6 hose. Connections at the primary and secondary fuel filters were also 5/8" flare.

I find it interesting that on J.D.'s coach that FT replaced the 2556-10 hose (0.63" or 5/8" inside diameter) with the Parker HTFL 10B hose which is less than 1/2" ID at 0.441".

While some parts of the hose look fine, other areas have visible diesel permeation and plenty of cracking. The worst offender is the line between the primary and secondary fuel filters on the Cummins, the return fuel line, and pretty much everything on top of the fuel tank. Everything that was enclosed in the ducting and protected (barring the fuel tank area) shows no signs of permeation.

Re: Old Fuel Lines

Reply #41 – February 20, 2014, 06:47:28 pm

The fittings listed on Pierce's page look like the push on and can be removed/reused, have used many of them, but due to cost difference I prefer the standard brass Farrell with stainless insert. These can be reused also, just need a new Farrell.
I will run the larger size lines to the ISM.

Re: Old Fuel Lines

Reply #42 – February 20, 2014, 07:31:19 pm

Quote from: rsihnhold – February 20, 2014, 05:48:50 pm

Just to keep this information in one spot for anybody thinking about doing it themselves, all the ports on the top of the fuel tank for both supply and return are 1/2" NPT female connections with a 90 degree male NPT to flare fitting installed.

The supply for the Cummins has a 5/8" flare connection on it with the Aeroquip 2556-10 hose and all others are a 3/8" (flare 37 degrees) or -6AN flare fitting with Aeroquip 2556-6 hose. Connections at the primary and secondary fuel filters were also 5/8" flare.

I find it interesting that on J.D.'s coach that FT replaced the 2556-10 hose (0.63" or 5/8" inside diameter) with the Parker HTFL 10B hose which is less than 1/2" ID at 0.441".

While some parts of the hose look fine, other areas have visible diesel permeation and plenty of cracking. The worst offender is the line between the primary and secondary fuel filters on the Cummins, the return fuel line, and pretty much everything on top of the fuel tank. Everything that was enclosed in the ducting and protected (barring the fuel tank area) shows no signs of permeation.

Thanks for this info! I've been working to source these parts with little success so far as it seems that Parker dealers don't actually stock, or are unfamiliar with these products, in S. Tx. at least. I do have a question, though, regarding line size.

It sounds like the 1/2" NPT fittings at the tank are a choke point for the 5/8" I.D. hose. The 1/2" NPT fittings are pipe size, right, so half inch inside dia? Do you see any advantage in reducing the size of the return line from engine from 5/8 to 1/2?

If anyone else is interested, and we can find a quantity price on the thermoplastic line I'll be happy to buy, divvy up and ship if we can save a few bucks.

Re: Old Fuel Lines

Reply #43 – February 20, 2014, 08:01:55 pm

Quote from: Chuck Pearson – February 20, 2014, 07:31:19 pm

Thanks for this info! I've been working to source these parts with little success so far as it seems that Parker dealers don't actually stock, or are unfamiliar with these products, in S. Tx. at least. I do have a question, though, regarding line size.

It sounds like the 1/2" NPT fittings at the tank are a choke point for the 5/8" I.D. hose. The 1/2" NPT fittings are pipe size, right, so half inch inside dia? Do you see any advantage in reducing the size of the return line from engine from 5/8 to 1/2?

If anyone else is interested, and we can find a quantity price on the thermoplastic line I'll be happy to buy, divvy up and ship if we can save a few bucks.

I did quite a bit of research on this before getting my fuel lines and here is the best descriptions I found.

Understanding Fuel Line Sizes vs. Fuel Supply Restriction

Technical Article Number One- The Cummins Lift Pump

Technical Article Number Two - The Diesel Fuel System and Inlet Line

This site has some other interesting articles and descriptions of how they do things. Good reading anyway.

Marine Fuel Filtration - ?The Seaboard Way?

SMX Multi-Stage Fuel Fueltration? Installation Examples

I ended up using Trident 365 A1-15 for my lines since I couldn't find anyone willing to sell less than full reel quantities to me and I could get it in 50' boxes for about $2 a foot. The HTFL line can be had for around $2 per foot if you buy a whole reel and are willing to special order it. Foretravel was willing to ship whatever quantities I wanted but were charging over $6 a foot for the larger lines. The HTFL line seems like the best way to do it though.

Re: Old Fuel Lines

Reply #44 – February 20, 2014, 10:53:51 pm

Some good reading there. Interestingly enough I spoke with Tony (the guy who wrote the filtration series) a few days ago about a boat repower. Great info.

Re: Old Fuel Lines

Reply #45 – February 21, 2014, 12:06:16 am

While on this subject of "cracking Hose lines" I looked at the ones to Generator while I had the gen pulled out some to get to that slide stepe cylinder and noted some small ones on those lines. I decided to wrap the last 6" of lines with a few layers of the Silicon "Rescue Tape" that is very good. It binds well together as it goes on so I do not think I will have any air leaks at those points. The rest of line I could see was good.
Should mine give a problem I will be running them in pvc Tubing under the coach so I do not have to pull them thru race ways etc. I can do that from my Pit, and do not see a problem with doing it that way either in Sch 40 pipe
JohnH

Re: Old Fuel Lines

Reply #46 – February 21, 2014, 08:05:11 am

DAM----- wish I had a pit !!!!

Re: Old Fuel Lines

Reply #47 – February 21, 2014, 09:45:18 am

Has anyone replaced the heater hoses when replacing the fuel lines?
I think they all run together through the coach.

Re: Old Fuel Lines

Reply #48 – February 21, 2014, 10:03:34 am

On our '91 I'm sure the fuel lines are original and this thread got me thinking. I didn't see a reply on the cost to have FOT do the replacement...can someone prepare me for what we might be in for please...you can put it in terms of "coach bucks"

Re: Old Fuel Lines

Reply #49 – February 21, 2014, 10:56:24 am

Peter, I could be wrong but seem to remember someone saying that the older GVs do not have the same type of lines and do not break up like the later models. Sure someone will correct me if I am wrong.
JohnH

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