From: Ken Boge (ken@clovermachine.com)
Date: Mon Aug 01 2005 - 17:10:35 PDT
Ike,
My deuce has the original fuel lines from 1970 except for one that I
replaced the other day just for the fun of it and I haven't had the type of
failure you describe.
The thread for a 3/8" compression fitting is 9/16-20 UN.
If you use plastic tubing, don't forget the ferrule inside the end of the
tube to prevent it from collapsing too much. One problem with compression
fittings is over tightening. Tighten just enough to stop it from leaking.
Your best fix might be to replace the plastic line with copper for a more
permanent fix.
I wouldn't try tapping the current fitting for NPT. You'll end up with a
leaky mess. Orchard Supply has a good selection of fittings that you could
use to change over to barb fittings if you really want to.
I seem to recall that you are located in northern CA. If you need more help
let me know. I'm in Santa Clara.
Ken
> Hi Everyone...
>
> I'm having repeating trouble with a fuel line on my '71 multifuel deuce.
>
> I want to replace this stock line either with a commercially-made
> steel-braided hydraulic line, or with simple barb fittings with some
> high-quality fuel hose and double worm gear clamps so that if (when) it
> does fail again in the field, I can at least replace the hose more
> easily than I can with the original compression fittings and line.
>
> Here are my questions:
>
> 1.) What is the darned thread size and threads per inch on these
> fittings? It looks a lot like a 1/2" 20 TPI, but I tried that and it is
> loose in the engine's inlet and outlet connections...it won't tighten.
> I need to know the thread size before I can get the proper fitting,
> otherwise I will have to take off the elbows and tap them to a standard
> tapered NPT thread so I can use standard NPT fittings.
>
> 2.) This must me a common failure on deuces...what have you others
> done to permanently fix the problem?
>
> Thanks for any tips!
>
> --
> Jim 'Ike' Newton
> MILDOCS.COM
> The World's Largest Public ETM Search Site
> www.mildocs.com
> 1 (650) 766-6306
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