> Took an old gas engine; 2-3hp is best, 5 is too hard... which was 
 > hooked up to an old DELCO truck generator (NOT alternator) with an
 > 
 > 8" pulley on the engine with the standard 2-3 inch V-belt pulley on 
 > the generator. 
 >  
 > I disconnected the gas tank and gasline, and drilled a ¬" hole in 
 > the air filter through which I fed a copper tubing LPG line right 
 > into the throat of the carb, past the choke, which is disabled. 
[[much good, detailed stuff deleted]]
Day,
 Thanks for the very good description of your backup power unit. You 
certainly had an effective unit, and at low cost to boot!
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