Let's say you pour some fuel additive in your tank, but maybe the special funnel wasn't seated properly.

You don't realize it since it seems all of it went in and nothing overflowed.

But the next day you find small puddle of additive on garage floor, leaking near left rear wheel.

If it wasn't going INTO the tank, Where the hell did it go?!

Asking for a friend

 

May have just found the drain tube and took a while to hit the floor.