Pre 77 Wagon guys

I have the "hump" gas tank and the filler neck is almost completely horizontal. Any of you have the problem of gas backing up in it? My car constantly leaks out the filler port when trying to fill up. I did pull the filler neck one time, to replace the grommet on the tank. It was pretty clear straight through, aside from some white surface corrosion at the end. This drives me crazy. I have to hold the pump at a funny angle and let the fuel trickle in slowly. It usually still leaks a lil bit.
Author: Leizurtime