Not as much of an option as you'd think. You generally don't know your tank
is full until gas comes out of the overflow which, of course, is over the
water. Some gas is spilled more often than not. Gas evaporates pretty
quickly and such small amounts don't last long enough to be a significant
problem.

Lee

after 40 years you would think the installation of a sight glass would
occur to you. or simply dipping the tank and having a relatively good
idea of how much fuel you need, or a spill pan around the fill, or any
of the several other ways to stop overflow problems.

it only took me one fill to figure out a sight glass on the Terry L,
from that experiance every ship or boat I get on gets a deck visible
sight glass. saves me from those pesky $5,000 fines.