I've got a 2005 Jeep Liberty.

Whenever I fill the gas tank it has a tendency to overflow before the
nozzle shuts off. Sometimes it's a lot, sometimes a little. If I try to
judge how many gallons I'm going to need and then let up on the nozzle
for the last bit it's kind of under control but still - almost always -
overflows. If I let up a lot on the nozzle it will flow forever until I
notice it spilling out.

At gas stations that have full vapor controls on their nozzles I don't
have the problem.

What's up with that?

Jeff