Hi Bob, Thanks for the comments. I too, often shut off the fuel valve leading to the carburetor, and let the engine quit - as a safety thing. I did experience a loss of grounding on my ignition switch once - couldnt shut it down ! I have had some concern about letting gaskets drying out tho, so try to run it up every week to prevent this..
Recently I have experienced an interesting problem - I use Amoco Ultimate in the coupe. Not flying much these days - with weather & Swiss cheese problems - but keep the tanks full. I have acquired a green deposit on the underside of the fuel caps. Interesting deposits - not real hard, and none in the tank. I sent samples to Amoco, and they really wern't interested. I suspect copper (?) salt deposits of some kind, but haven't followed up. It is pasty, not hard. I decided on Amoco Ultimate back in '83 -'84, after testing all available mogas and av fuels for their suseptibility to absorbing water. The ultimate immediately seperated out, after being shaken with water. All other fuels, including the av gas stayed insuspension for several minutes, some for hours. (Shell, Mobil, Exxon, Texaco, Amoco, Mogas and Exxon 100 LL AV gas) I also soaked 1/8th in. gasket materials in the fuels to observe swelling, and again the Amoco Ultimate had the least swelling. Yes even less than the Exxon 100 LL av gas. Now, I haven't tested these fuels lately - maybe need to do so again, especially with the green deposits forming... Here in the lowland East, Ultimate is 93 octane. I am aware that the Continental was certified on 73 octane fuel, and doesn't need 93 oct., but with no lead, seems like a nice fuel to use, with no sparkplug deposits, etc. Fly Safe - Have Fun Harry Francis 93530 BCB
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