[GMCnet] PEX Tubing in Fuel service.

[John Wright]

CB,
I went and reviewed several Chemical Resistance Charts for PEX tubing. It appears that the hydrocarbons in gasoline and the alcohol additives have no long term affect. The only warning that I would be concerned about is that PEX tubing in not resistant to UV light, so extended exposure (for more than a few weeks) to direct sunlight must be avoided. This may or may not be an issue as most UV would be indirect. Other than that PEX tubing should be great and like you said use the proper fittings and crimps and I would not see any real issues in using it.

JR Wright
GMC Great Laker MHC
GMC Eastern States
GMCMHI
78 GMC Buskirk 30’ Stretch
1975 GMC Avion (Under Reconstruction)
Michigan

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[rally...@juno.com]

If it's not covered up, paint it; same advice I've gotten for PVC pipe.

RonC
On Mon, 28 Apr 2014 12:54:59 -0400 John Wright <powe...@chartermi.net>
writes:

Ron & Linda Clark
1978 GMC Eleganza II
North Plains, ORYGUN

[John Wright]

[John Wright]

Ken does have a concern with the PEX used for gasoline. I went out to 4 addition sites on PEX including a report by the Consumer Federation of California and the concerns some have is the durability of PEX associated with potable water and the possible permeation by outside contaminants such as gasoline or solvents. I guess that you might have issue of the permeation from inside to outside. I guess now that I have gone further I would not use PEX for fuel service. I personally would use copper pipe and solder fittings. That is what was installed in the Buskirk Stretch that we own. I did a complete fuel system rebuild this past December before we left for Tucson including in-tank fuel pumps and all new plumbing. I will be posting later today or tomorrow the photo album to what was completed.

JR Wright
GMC Great Laker MHC
GMC Eastern States
GMCMHI
78 GMC Buskirk 30’ Stretch
1975 GMC Avion (Under Reconstruction)
Michigan

[Gary Worobec]

Frankly, I would not use copper pipe and soldered fittings on a fuel system.
The vibration will weaken to the solder joints and they will fail. While
this is not a boat the American Boat and Yacht Council strictly prohibits
soldered copper gas lines. As well, the Copper Development web site
http://www.copper.org

(copper manufacturers) indicates the following:



Should one use solder or silver solder for joining copper tubing in fuel gas
system?



Any fuel gas lines installed using copper tube must be brazed using a filler
metal containing less than 0.05% P (phosphorus) and a melting temperature
greater than 1000 degrees F. The only filler metal (trade and industry
standard) that contains less than the 0.05% P would be an AWS BAg type alloy
(according to the American Welding Society's AWS A5.8 specification). In no
case should solder or "soft-solder" be used to join copper tube and fittings
in fuel gas systems.



Something like silver solder looks like it would be ok.



Just passing on some info for what it's worth.





Thanks,



Gary and Joanne Worobec

1973 GMC Glacier

Anza, CA

-----Original Message-----
From: gmclist...@temp.gmcnet.org
[mailto:gmclist...@temp.gmcnet.org] On Behalf Of John Wright
Sent: Monday, April 28, 2014 12:17 PM
To: GMC Net
Subject: Re: [GMCnet] PEX Tubing in Fuel service.



Ken does have a concern with the PEX used for gasoline. I went out to 4
addition sites on PEX including a report by the Consumer Federation of
California and the concerns some have is the durability of PEX associated
with potable water and the possible permeation by outside contaminants such
as gasoline or solvents. I guess that you might have issue of the
permeation from inside to outside. I guess now that I have gone further I
would not use PEX for fuel service. I personally would use copper pipe and
solder fittings. That is what was installed in the Buskirk Stretch that we
own. I did a complete fuel system rebuild this past December before we left
for Tucson including in-tank fuel pumps and all new plumbing. I will be
posting later today or tomorrow the photo album to what was completed.



JR Wright

GMC Great Laker MHC

GMC Eastern States

GMCMHI

78 GMC Buskirk 30' Stretch

1975 GMC Avion (Under Reconstruction)

Michigan

On Apr 28, 2014, at 12:54 PM, John Wright < <mailto:powe...@chartermi.net>

[Robert Mueller]

JR,

Along with compatibility with fuel one must take into consideration the minimum radius PEX can be bent at as that could cause
problems in the area where the lines come down off the top of the tank and then head forward. You'd probably have to use fittings
and short sections of PEX.

If one wants to go to "solid" lines it seems to me that Poly Armor would be simpler.

Regards,
Rob M.
Sydney, Australia

-----Original Message-----
From: John Wright

CB,
I went and reviewed several Chemical Resistance Charts for PEX tubing. It appears that the hydrocarbons in gasoline and the alcohol
additives have no long term affect. The only warning that I would be concerned about is that PEX tubing in not resistant to UV
light, so extended exposure (for more than a few weeks) to direct sunlight must be avoided. This may or may not be an issue as most
UV would be indirect. Other than that PEX tubing should be great and like you said use the proper fittings and crimps and I would
not see any real issues in using it.

JR

[Al The HeatGuy]

Fuel gas refers to Gaseous fuels such as natural gas and propane. But I
agree that soldered joints, copper or anything that can work harden and
crack should not be used.