98 V70 AWD w/ 113,000 miles. I have been noticing a strong smell of gas around the rear passenger side. My garage is full of fumes to the point I have to park the car outside. Tonight I was looking under the car and on the same side, I noticed a dark stain on the bottom of the tank. I followed it toward the front seam of the tank, which is protected by a trim piece. Underneath on the seam of the tank it was very wet with gas. I initially thought the tank was leaking at the seam. Now I'm thinking it is coming from the top a hose a hose or something. Do these tanks leak, or is it leaking from something up top? Can I get to the top of the tank from inside the car or does it have to be dropped?

TIA