My tank will force some fuel out the overflow if the air temp swings
around a lot and I have filled it very full. Gas expands and contracts
a lot with temperature changes. Spilled gas turns into gas fumes
pretty quickly and doesn't leave much trace of the original spill.

You should check any signs of liquid on the gas lines, in the bilge,
the fuel gauge sending unit, and anywhere nearby to see if it is gas or
condensation. Just get some on you fingers and smell it. If you have
liquid gas somewhere it's not supposed to be you need to figure out
what is leaking. I suspect you just had an overflow though.

I have learned to listen at the fill tube for the signs it is getting
full. Mine starts to gurgle differently when the gas going in reaches
the top of the tank. I quit then. Normally I only fill before storing
at the end of the year so it is not much of a problem for me. During
the summer I fill on the way to the ramp.

Keith wrote:
Check your tank vent. It may be blocked, and as the tank warms up, the
fuel is expanding and leaking out wherever it can. I had to dig a
couple of dirt dauber nests out of my air horns the other day... little
*******s!
brian wrote:
brian wrote:

ok, i have taken a better look at my boat and have noticed something
differant. where the incoming hose connects to the fuel tank it is sort
of wet. not realy, kind of like a sweat.. we have had realy hot and
humid temperatures the last few days so maybe that is what has done it.
where would the fuel be coming out from though?