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Old 04-07-2014, 11:49 AM   #1
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Copper vs. Rubber fuel lines

I'm getting ready to install a Racor dual filter in place of my single. The fuel lines are all copper. Rather than dealing with cutting/flarring my plan is to replace all lines with rubber and barb fittings. Copper is probably a much better system; but I also intend on changing shutoff valves, etc.. Barb/rubber will save me a ton of labor. Eager for any advice before I dive in.
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Old 04-07-2014, 12:06 PM   #2
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I switched to rubber...yes took minutes not hours to do....

May not last as long...but easier to fix short and long term. Probably will reroute lines before either need actual replacing.

Happy with the result, also easier to mod a little if you need/want to reroute a little if you leave a loop/slack.

Just put 2500 miles on the new copper fittings manifold and plain old USCG compliant fuel hose from any marine vendor.
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Old 04-07-2014, 12:19 PM   #3
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Yes, rubber for me too.
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Old 04-07-2014, 12:25 PM   #4
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My boat is plumbed with copper between fuel tanks and manifolds and with rubber elsewhere.





Seems like a practical/flexible solution.
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Old 04-07-2014, 01:50 PM   #5
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Thanks guys. I feel much better about upgrading.
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Old 04-07-2014, 01:57 PM   #6
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Rubber

And I like your set-up Mark. I always stagger my hose clamps 180 degrees too. Wish there was a better hose clamp that is economical. I'm referring to my hose clamps.
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Old 04-07-2014, 02:34 PM   #7
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If you go with hose, I'd use clamps with no perforations and made of 316 SS.

AWAB Marine Grade Fuel Hose Clamps
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Old 04-07-2014, 03:00 PM   #8
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This blue stuff for us.
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Old 04-08-2014, 06:16 AM   #9
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Buy extra hose and clamps so repair/replacement will be easy.

DRAW out your intended fuel line diagram and attempt to figure all worst case scenes.

Foolproof may be impossible but the system should handle a mistake with ease.
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Old 04-08-2014, 06:52 AM   #10
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Swapped out to rubber here too:


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Old 04-08-2014, 07:06 AM   #11
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Greetings,
Mr. psneeld. Am I seeing Teflon tape on some of your fittings (post #2)? I thought there was a thread somewhere that strongly suggested NOT using Teflon but some sort of pipe dope instead. NOT a criticism, just an observation.
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Old 04-08-2014, 07:17 AM   #12
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I just used Thread-Lok Blue.
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Old 04-08-2014, 07:37 AM   #13
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Quote:
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Greetings,
Mr. psneeld. Am I seeing Teflon tape on some of your fittings (post #2)? I thought there was a thread somewhere that strongly suggested NOT using Teflon but some sort of pipe dope instead. NOT a criticism, just an observation.
I also use teflon tape, not an issue properly applied (leave first 2 threads bare).
Someday I might change to a loctite type.
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Old 04-08-2014, 09:04 AM   #14
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Quote:
Originally Posted by RT Firefly View Post
Greetings,
Mr. psneeld. Am I seeing Teflon tape on some of your fittings (post #2)? I thought there was a thread somewhere that strongly suggested NOT using Teflon but some sort of pipe dope instead. NOT a criticism, just an observation.
The issue with the tape is that small pieces of tape can break off and enter the fuel system. Possibly not when you first put the fittings together, but when you later take them apart.

This is not something I have personally experienced but it's advice I've read from experts and it makes sense to me. Since fuel rated pipe dope is just as easy to use as tape, I use the pipe dope.
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Old 04-08-2014, 09:56 AM   #15
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My fuel lines are all copper but I will probably do it in rubber when I re-pipe it.
It allows for more flexibility to make changes easily on the run if ever required.

Teflon tape is great IF you use a quality product and apply it properly. Use 2-3 tight wraps clockwise (looking at the end of the fitting) and as said don't cover the first tread or two.
I use it at work on oil and gas fittings up to 10,000 psi.
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Old 04-08-2014, 10:43 AM   #16
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Quote:
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This blue stuff for us.
Those look like reusable fittings with the left hand thread that screws into the hex hose fitting and then has a female hyd fitting on the end ?
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Old 04-08-2014, 11:10 AM   #17
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Those look like reusable fittings with the left hand thread that screws into the hex hose fitting and then has a female hyd fitting on the end ?
Say what? They look to be hydro fittings, I'll see if I can get a better picture.
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Old 04-08-2014, 11:26 AM   #18
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Yes they look like the orange hose I used for hyd steering .. except blue. That hose I purchased from a commercial dealer specializing in hydraulic fittings for back hoe's and the like.
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Old 04-08-2014, 11:58 AM   #19
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I worked for a bearing house for a while and customers used to bring hoses in like this for repair . Most of the time they didn't know the the fittings were reusable. It's kinda exspensive to start out with this kind of hose and fitting but I think it probably pays off in the long run if your going to use a hyd type hose .
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Old 04-08-2014, 01:36 PM   #20
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Swapped out to rubber here too:
Don't want to derail the thread, but what's the flow rate of that pump?
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