I had a 46ax on my lt-40 using a 14oz tank and never even came close to running it out before I was tired of flying it., now the same plane has a 61 with the same 14oz tank and flies till I get bored and land it, never have run out of gas. Unless your using an 8oz tank and flying rich at full throttle the whole time? If your in tank line has a slit or hole than as soon as the gas level gets to it your out, is the tank empty when you run out of gas?