My neighbor is a recently retired chemist and engineer with Valvoline which
is based here. Him and I have often discussed fuel additives and effects
and such. I am going to show him your email to get his thoughts. I too am
having or had some fuel related failures but never used mogas. I think mine
all stem from a gascolatir filter that disintegrated and contaminated my
fuel and using the semi clear blue fuel line that doesnt hold up over time.

Jeff York
Lexington,KY
Georgetown Scott County Airport

On Sat, Aug 4, 2018, 9:58 PM Ken Hurley via KRnet <krnet@list.krnet.org>
wrote:

> I'm sealing my wing tanks with a product from KBS Coatings
> (KBS-Coatings.com). Randy,  877-548-9323 ext 123, was very helpful. I hope
> to eliminate future problems.
>
> Ken Hurley
>
> On Aug 4, 2018 7:36 PM, "Jeff Scott via KRnet" <krnet@list.krnet.org>
> wrote:
>
> After years of running Mogas in both the O-200 in my KR, and the O-320 in
> my SuperCub, I have run into a particularly nasty bunch of Mogas after
> moving to Arkansas.  In NM, I had a good source for alcohol free premium
> Mogas and burned it for years with no issues at all.  But after moving to a
> new area, other than testing for alcohol, how does one verify that the
> mogas being sold is free of any detrimental chemicals?
>
> In April I started running a new brand of premium Mogas (everything where I
> moved is new to me).  Testing for Alcohol showed it to be alcohol free.
> This summer I was away from the planes for a few weeks.  When I got back to
> them, the flow meter on my fueling rig had failed (plastic gear that runs
> submerged in fuel failed), there were several leaks in my fueling rig,
> including the fuel nozzle and the hoses.  At the same time, both tanks in
> my supercub developed leaks and the O-rings in my primer failed.  I'm not
> sure what kind of additive is in this fuel, but whatever it is dissolves
> epoxy, pipe dopes, and damages neoprene rubber.    Impressive.  I was in a
> real panic as I had been running this stuff in both planes.
>
> I have spent the last 2 weeks working on the fueling rig and the planes,
> and trying to assess the damage to the planes.  What I found is, the epoxy
> tanks in the SuperCub are both compromised and leaking at points where
> there were penetrations through the tanks for various plumbing parts like
> the fuel drains and fuel pickups.  I will have to cut the tanks open and
> repair from the inside, which will give me a chance to better assess the
> damage.  Additionally, the O-rings in my 2 year old primer failed.  New
> O-rings and some fuel lube fixed the primer problem.
>
> The fueling rig in my truck (12V fuel pump, flow meter, filter assy, and
> fuel nozzle all mounted to a 110G steel tank) had to have new hoses, the
> 1-1/2 and 2 inch piping had to be dismantled and put back together with new
> pipe dope.  The fuel meter had to be replaced.  And the fuel nozzle needs
> new O-rings.
>
> I drained the tanks on the KR, which are also epoxy, but were sloshed with
> an alcohol resistant slosh compound 22 years ago.  Upon inspection I can
> see that the fuel etched the surface of the slosh compound, but I can't
> find any peeling or flaking compound; and I have no leaks.  So at least the
> KR is OK for now.
>
> Not looking for advice, but am putting this out there for discussion.  I'd
> love to hear ideas about how one verifies that the fuel is good other than
> testing for alcohol.  I don't need to hear about the wonders of vinylester
> as that was an unknown at the time my KR was built, and the tanks in the
> Cub were already built when I bought the project.
>
> For now, the KR is still flyable.  But it is unlikely I'll complete the
> fuel tank and wing repairs to the SuperCub before late fall.
>
> -Jeff Scott
> Cherokee Village, AR
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