Went to go "fill up" my dad's 86 iroc and it stopped filling at quarter tank, When we parked it on the driveway (incline) it was fine until I turned it off and gas started pouring from the car. We aren't sure but the car still runs normally and everything but it's just so weird. Any Ideas?

 

Pouring from the car where?
At the engine or near the tank or somewhere between?

 

It was near the tank, coming to find out we just overfilled it.