I replaced the fiberglass wing tanks in my KR-2 with welded aluminum tanks. Ethanol in the mogas, that I was trying to use, was dissolving the Vinyl Ester resin rather quickly. Rubber components in the carb were being hardened and would not seal. (Lots of fun and excitement when the carb overflows while the engine is running.) Now using 100LL exclusively. The fuel system is good to go now. The tank change out and carb rebuild cost about $1500 and six months down time.
Sid Wood Tri-gear KR-2 N6242 Mechanicsville, MD, USA ----- Original Message ----- > Pure gasoline should be good with glass & plastic tanks... > > Ethanol degrades certain rubber-ish compounds & the interior of some > varieties of fuel-lines... The 'mush-ifying' of fuel-tanks has been a > problem for fiberglass boats, too... > > So even without glass tanks... 'Keep the booze in your glass & out of > your gas'... > > Fortunately, my airfield has pure gasoline on-field.... > > On 8/3/2013 8:37 PM, Jeff Scott wrote: >> This last winter the cost of 100LL finally hit my pain threshhold when I >> realized I had burned $7000 in 100LL during 2012. With a $2 per gallon >> difference, burning Mogas will make a significant impact over the course >> of a year. In February I dragged my old 100 gallon tank out of storage, >> serviced the electric pump, replaced the filters and hoses, then put it >> back to use hauling mogas. The only alcohol free Mogas in our area is 90 >> octane AKI and is 35 miles away. >> >> I have been running a mixture of 80% 90 AKI Mogas and 20% 100LL in both >> planes. The O-200 in the KR and the O-320 in the SuperCub are both 8.5:1 >> compression engines. My KR has sloshed Saf-T-Poxy tanks and the Super >> Cub has glass tanks that were made with an unknown resin before I bought >> the project. Neither seem to be any worse for having used Alcohol free >> Mogas. >> >> I have seen disastrous results from using alcohol contaminated fuel in >> glass tanks. One was thousands of $$ damage to the fuel system of a >> Cherokee 235 and the other totaled the plane (a Grumman Cheetah), so be >> sure to test your fuel. >> >> Jeff Scott >> -Los Alamos, NM >> >>> ----- Original Message ----- >>> >>> NetHeads, >>> >>> For those who'd rather burn ethanol-free fuel, there's a website that >>> lists most known vendors in the US and Canada at >>> http://www.pure-gas.org/ . >>> Mark Langford >>> ML at N56ML.com >>> website at http://www.N56ML.com >>> --------------------------------------------------------
