3 things it could be
1st hole in side of tank.
2nd fuel hoses have a hole in them, there are only 2.
3rd the fuel pump seal is bad so it splashes out.

you can get under the car and see most of the tanks sidewalls to check for holes
and get in ur trunk and take the little cover off of the fuel pump housing start the car check for hose leaks.
and the fuel pump seal is just a thin rubber ring that goes bad and lets gas splash out while moving..
so check all of that and report back