Our Generac impact-36 rated fuel usage
FUEL CONSUMPTION (IN GALLONS PER HOUR):
LOAD - GASOLINE - LP
NO ------ 0.14 --------- 0.20
HALF --- 0.32 --------- 0.41
FULL --- 0.54 --------- 0.77
Mine, 2001 vintage, was available LP or gas, virtually same generator The only difference in part numbers is fuel system parts and few sheet metal bits. Shows identical engine controls charging electronics etc.
LP: carb, regulator, LP solenoid
Gas: carb, fuel pump, filter
If you had owners manual it lists the different part numbers for both. Though I'd do more research it appears it may be as simple as swapping fuel systems ~$150. Quick look around parts available, carb, F/P.
Conversion seems simple enough. However fuel source isn't included, which to me is real hurdle.