Tony Abbott wrote:
How does one check for a fuel tank leak?

The best way is with air pressure (about 3 psi) and soap bubbles.
However, it's likely that you've got a tank partially full of gasoline,
which makes this impractical and potentiall dangerous.




... The boat is a 1974 33' Silverton
with an alumimun(?) gas tank under the cabin floor, 250 gallons. It is a
gasoline based boat.

The first thing to do is clear as much access to that tank, and the
bilge around it, as you can. Get all the water out, use a sponge and
then paper towels. If you can't dry this part of the bilge, partition it
off with some plumbers putty. After sopping up all bilgewater and fuel,
wait a while and see if more fuel appears. If yes, then track it down.

Fair Skies
Doug King