Gas tank
When you say it only leaks when you fill it up - do you mean WHILE you are at the pump, adding fuel to the tank , or WHEN the tank is full??
If it happens during refueling, the filler neck may have rusted allowing some fuel passing thru it en route to the tank to leak out. The filler neck can be replaced - and may even be subject of a recall. Contact you dealer to make sure it hasn't been recalled for these types of problems before spending *your* money to fix a manufacturer's defect.
Many times, this indicates a tank that has a hole near the top of the tank - which is much better than one at the bottom. There are products - and professionals - that can repair (or replace) these problems / parts. Locating and accessing the hole can be another story however.
Removing the tank for repair / replacement can cause you to incur additional expenses to replace fuel senders, etc. that seem to be fragile enough to break during removal.
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