Al Gilson wrote:
: We have a 1964 Cessna 172E with a Continental 0-300D. It has the
: AutoGas STC, but we've never used anything but 100LL. We've had some
: lead deposits and a stuck valve last spring.

That engine is allegedly *MUCH* happier on mogas than 100LL.

: Is there a resource for tips on using MoGas? Filtering, checking for
: alcohol, vapor lock problems, freshness, water, etc.

I've got a Cherokee I run mogas in. I debated on building a smaller version
of Jay's Grape... like a largish can on the hitch of my car, or maybe a small trailer.
I've ended up just using 5 gallon cans, with a pour-spout I built containing a
spin-on water-absorbing fuel filter. It really alleviates any contamination fears I
have from self-fueling from small cans.

I would probably be less excited about it if I had to lug each can up a ladder
to a high-wing. You might want to look for a 55-gallon drum with a hand (or
14v-powered) transfer pump to split the difference.

: Right now our co-op is selling 100LL for $3.70 and MoGas is just under
: $3. We'd save about $6 per hour on MoGas. Is it worth the risk and
: hassle. I don't know how excited I can get about lifting a 5 gallon jub
: up to fill a high-winger.

If the fuel is filtered and you test it for alcohol, the risk is pretty
minimal. Peterson has a vapor-pressure kit to test for that which we got when we
bought the STC. It's basically a syring with a vacuum gauge you screw on. Pull a
vacuum until the fuel sample "boils" and read the gauge. Even in the hottest of
summer days, the samples I've drawn are right on the bottom of the "OK" range. The
100LL I've pulled at the same time for comparison was only slightly better. I rarely
test that anymore.

: Just hungry for some info. Thanks in advance from the group.

I'd highly recommend it if you can do it. Between that an THOROUGHLY
understanding how to lean (or more importantly, the times when you cannot), you can
likely reduce the fuel bill and have a healthier engine.

-Cory

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************************************************** ***********************
* Cory Papenfuss, Ph.D., PPSEL-IA *
* Electrical Engineering *
* Virginia Polytechnic Institute and State University *
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