Fuel tank wont fill

Asked by Sep 01, 2016 at 11:13 PM about the 2001 Pontiac Firebird Convertible

Question type: Maintenance & Repair

So i drive a 2001 pontiac firebird 3800 series II, and
i went to fill my tank up (about 14 gallons every
thursday) and it only put 8 gallons in. I thought ok
maybe the handle just clicked, so i started
manually pumping and it instantly clicked. Pulled
the nozzle out a little bit where it was still in the
filler neck and slowly started pumping. Eventually
gas started coming out of the filler and spilled
down the side of my car. What could cause this
because i jave never had this happen.

2 Answers

18,515

Assuming the tank was actually empty and you weren't fooled by a bad fuel level sending unit, you may have a problem with the EVAP system. Pressure builds in the gas tank when you fill it with gas, that pressure is sent to the carbon filter to recover gas from the vapors and the air is vented. If the vent hose is fouled/plugged or carbon filter is saturated with fuel the pressure can't escape and causes fuel to slosh out the filler neck. You should have the vent valve/hose inspected for restrictions. If the carbon filter has been frequently saturated with fuel (a side effect from constant overfilling) it will need to be replaced.

My gas gauge doesnt work lol, but i fill up every pay day which is thursday, only reason i knew it should of taken more than 8 gallons. It sounds like the vent is cloggeg because this is the first time ive ever overfilled in the past 3 yeara of owning the car. Guess ill be doing that this weekend and hopefully its just the vent. Thank you for the help.

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