Jerry
It must be the season because our Syncro Westy just did the same thing. I
was able to fix it without replacing the seal. It is a syncro so the tank is
in the wrong end and getting to it is difficult. Last year I replaced the
motor with a Subaru 2.2 and while I was in there I replaced the gas tank
support straps. I forgot to loosen off the filler pipe when I tightened up
the straps. I reasoned that the current leak was caused by the tank pressing
more on the top side of the filler pipe allowing gas to seep under the
bottom of the rubber gasket.
I drained my tank; removed the filler pipe; cleaned it up, coated the end
few inches with Permatex (gasoline compatible) gasket sealant; waited for
the Permatex to start to set up; then reinserted the filler pipe a bit
further into the tank; fastened the hose clamps and screwed down the pipe
fastener; refilled the tank and had no leaks; let stand for 24 hours for the
Permatex to finish curing.
No more leaks yet.
Your 2wd tank may pose some other challenges being metal where the 4wd is
plastic.
Good luck
Larry