Got a LA105, I turned it off one day, but it wouldn't crank back up. I changed spark plug, fuel lines, fuel pump. Still nothing! I ran fuel line from the gas tank straight to carb and it runs as long as the gas level is above the fuel filter. But when it gets below that, the gas to the carb slows down but I don't let the carb get empty. No gas thru the old or new fuel pumps? WTF????