bandicoot58 wrote:@Chester362
Thank you, I will check these, it is quite hot in here, since we are getting through summer

If 1.5 gallons has leaked out, then it's probably not what I thought.

More like Neal says, leaking fuel tap & float valves. Or, you've left the fuel tap on & the carb float valves are leaking.

The part where it only occurs after you fill up got me thinking of my reasoning.

Mind you, American gallons are weedy small ones compared to our big English ones! It's about the only thing in America that isn't bigger!
Although, I've just thought, your "pints" of beer are weedy small ones too!