[T3] Is there a real issue with using 5/16" ID fuel hoseratedSAE 30 R7 ?

[William J]

Jim what part number Parker hose do you use? I looked at their site and see 
a few different hoses for gasoline with Ethanol yet they don't talk much 
about if one can use FI type clamps yet the sell stainlees steel worm clmaps 
for low pressure systems . I saw some fuel lines that are rated 30r7/ ? and 
some that state 5 year life span. I didn't see the ethanol rating for the 
fuel line for engine application .
----- Original Message ----- 
From: "Jim Adney" <jadney at vwtype3.org>
To: <type3 at vwtype3.org>
Sent: Wednesday, August 23, 2017 5:54 AM
Subject: Re: [T3] Is there a real issue with using 5/16" ID fuel 
hoseratedSAE 30 R7 ?


> Much of the problem here is that people tend to lump different kinds of
> elastomers together as "rubber." The author of the piece you cited does
> somewhat well at avoiding that trap, but not completely. If you take a 
> look at
> the web sites of makers of O-rings or hose, you will find that there are 
> at
> least a dozen different families of elastomers and each family has 
> multitudes
> of members.
>
> It's hard to believe that any major hose manufacturer would make fuel hose
> today that would not be compatable with large amounts of ethanol.
> Remember that Russ told us that his company, Mahle, switched to rubber
> seals that were compatable with E85 years ago. That doesn't mean that it
> would be impossible to come across hose that's been sitting in a warehouse
> for 20 years, or that came from a no-name manufacturer, but it's unlikely.
> Note that most hose also comes with dating printed on it.
>
> I recommend Parker for their web site, but for a really good idea about 
> the
> range of elastomers out there, find a Parker O-ring catalog. I stock a 
> Parker
> fuel hose which has worked well for me in the 5/16" size. I used to get
> Airequip hose, but they discontinued the version that I liked. Both were
> good, but I have to buy it in 100' coils to get a decent price. I sell it 
> for $3/ft
> or 22' for $60 plus shipping. (22' will do a full '70-3 FI car; '68-9 
> takes a little
> less.)
>
> One place where the cited text goes wrong is with Tygon. Tygon makes
> dozens of different kinds of excellent, mostly low pressure, hose, each in 
> a
> variety of sizes. Only a couple of them are compatable with fuel; those 
> are
> all yellowish. I use those in my overflow hose repair kits and they have
> worked great. Other varieties of Tygon will work with fuel for short 
> times,
> then turn hard and eventually crack. That's not a Tygon problem; it's a 
> user
> problem because the user chose the wrong kind of hose.
>
> I don't think there is a Tygon hose suitable for 30 psi gasoline or 
> gasohol.
>
> So the short answer is that you have to make sure that you're buying FUEL
> hose. Water hose won't hold up, and hose for brake fluid is different from
> both of those. And it's also important to pay attention to the minimum 
> bend
> radius that the hose is rated for; this can vary a lot.
>
> -- 
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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