Over the last year or 2 I have replaced the primary filler tube and the smaller vent tube that goes to the middle of the tank. The last 2 times at the pump, I started to notice gas leaking out somewhere near the filler neck when the tank was about 3/4 full. Did this twice in a row now. Any ideas on finding the source of the laek without pouring more gas in? Can't use water, not sure about tryiing to pressurize it, might try a smoke test if I can figure out how to get a good seal, and I would have to build a cheap smoke generator. Luckily gas is $1.25 right now where I was filling up. I stopped as soon as I saw the dripping.