I never had this issue with any of the 4 Bonnevilles I've owned.

My 97 Chevy pickup on the other hand... Yes, that'* a bad neck design. Every pump is a problem.

I had that happen once. Ended up with gas all over my pants. Nice. Pumped lke an extra $3.00 or so. And this is AFTER tried to relese the handle.
The, the guy at the counter tried to make me pay for the extra gas. I was like "if it would have shut off when I tried to, it wouldn't ahve happenned". I was mad.

The only problem I've ever had was the pump shutting off too early. I guess if the "gun" is at just the right angle, the neck will fill up faster than it can fill the tank.

BUT.... I never just let it pump. I'm always right there, just in case.

Im not saying it comes gushing out. Only the first time in the winter when I was sitting in the car to keep warm. I don't let get past the point of squiritng out a little. But it is still very annoying.

You think that'* annoying... I had an Acura where the rubber hose between the neck and the tank would fall off occasionally. Try pumping a whole tank of gas on to the cement....

Lol, I'd be fuming... I haven't had any problems like gas shutting off early or not stopping when it should.

We have a 97 Seville where when we tanked it, it would ALWAYS shut off early. And it wasn't by a little bit, it would be a quarter of a tank left to fill. So filling it to the top is always a pain in the *** and a gamble, but you learn.

I always listen for the sound of the gas getting close to the top - just like the sound of filling up a bottle.

i always have the problem on certain pumps turning off early but that happened more in the bonneville.

once i was filling up and the car next to me started over filling and the nozzle actually shooting out of the car spraying gas every where, it was nuts

There a small hole in the end of the nozzle on the bottom. The pump is supposed to stop if that hole gets filled. I know they people at my mobile have to go out with a toothpick a few times during the winter if they get plugged up.

Any overflowing, imo, is a defective pump.