2008 ultra is not easy to fill with gas. Only fills when you fill it VERY SLOWLY otherwise it spits it back. Been that way since mile 1 and no dents etc in tank. 14,000 mile later...still hard to fill without a spill.
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There\'s a blockage in the secondary tube (about 15mm diameter) that runs down to the tank, adjacent to the main filler tube. Take the back wheel off and you\'ll see a plastic cover over the whole filler neck assembly. The secondary tube often rust and fills with dirt. The tube can get damaged too, if crushed the gas will spit back.
Unfortunately it's a manufacturing or maybe design fault. They all do that. It's the way the filler pipe and it's breather pipe are shaped. After the tank gets to about 9 liters before being full, the fuel covers up the breather pipe, so the air pressure builds up in the tank, compressing the air, and blowing the fuel back out the filler. It used to take about 5 minutes to fill the last 9 or 10 liters. If you do it slowly, which is difficult due to the auto switch off of the bowsers, it can be done without getting fuel all over your feet. It's a small price to pay for an otherwise great car!
Yes it happens to others. No one seems to have a fix other than don't fill up. I have gotten to where I can pretty accurately estimate how many gallons I need to fill it, and then cut it off before that point.
Every gas tank has a vent tube, so when you fill the tank, air can escape, while the fuel is being pumped into the tank. Some vent tubes are metal, some rubber. Yours is either collapsed or plugged up. Look at the fill tube in the firebird and follow it from the gas cap to the tank, there should be a 2nd smaller tube that is your vent tube. Check to see if it's collapsed, pinched, or bent. This is definitely your problem. Check out this web site for pictures of different fill and vent tubes to get an idea of what to look for. Good luck let me know how you make out. Curt http://www.carparts.com/REPLACEMENT-GAS-TANK-FILLER-NECK/GP_2005706_N__10618.car
I also notice this on my tiburon 2001, I find out that for a reason if I leave the keys in the contacts (even only at accessories), the problem occurs, but if I completly remove the keys while fillng the gas, no problem at all...