[Vwdiesel] Diesel tank leak

[mikitka]

I filled my 91 Jetta TD up Friday, filled it to the top, which is probably a
no no, anyway went away for the weekend, just got back to find a puddle
under the car and it dripping from the tank on the fill neck side. I can't
see anything such as the lines to the tank because it looks like they go up
into the tank from the top. Is it leaking because I topped it off to much?
Pulling the tank doesn't seem like a big deal but my mount bolts are so
rusted I might not get it back on if I can even get it down. Any
suggestions? Thanks