When fueling the tank on my '65 f85 the fuel spews back something terrible before it's even half full. I then have to slowly "throttle" the pump trigger a little at a time and can never get the tank completely full. Even with that it will spew the last bit when I release the filler.
If I find a station where I can fuel while parked down hill it does better, but still have to be careful.
Anyone have an idea what's going on here?
Thanks

 

Check your tank vents.

 

Makes sense. Are there more than one? Can I get to them without removing the tank? Thanks