< snip> The tank can be over full and the guage will read a little over
3/4. <snip>

Had the same problem.  Replacing the sender cured it.

<snip> .  If the tank is looking empty a the end of the day and we are
ready to camp then I wait until the next morning to fill up so we don't
have to smell gas while we are camping (cooking, eating, sleeping etc).
<snip>

If you can smell gas after a fill up .... then it's time to drop the
tank anyway.  Again, I had the same problem.  I dropped my tank and
replaced all the hoses, fittings, and seals (got the kit from Ken at
Vanagain).  No more gas smell when tank is full.

Mike
'84 GL 7 pass
'85 GL Westy