If anyone can help here appreciated. I have a 1999 Odyssey

I had an accident 3 weeks ago where my car rolled down my driveway (with no
one in it) and ran over some landscaping rocks. The rocks crushed my gas
tank.

They replaced the gas tank (and a few other minor things) - but now when I
fill up the tank completely - there is a smell of fuel in the car and there
is a small amount of fuel dripping from somewhere out of the top of the tank
and dripping on the garage floor. I can't see where its coming from but
obviously from the top of the tank somewhere. Again - this problem only
occurs when the tank is 100% full. If 95 % full - no leak. The small
amount of gas that leaks stops after the car has been turned off for 20
minutes (it does not continue to leak all night or anything like that).

Obviously - the van goes right back Monday morning - but I just wanted to
know - if not the tank - what else at the top of the tank holds fuel and
could be leaking for a short time after the Odyssey is turned off.

All help appreciated