Ok, very common problem with no real "fix" (that I know of). Your vent is located in the filler neck, hose runs parallel to fill hose.
Hold nozzle sideways, upside down, pull it back a smidge when filling, fill slower. find something that works for you.
If you pull a sight search, it should keep you reading for the afternoon.
__________________
'86 C-30 dually, 454/tbh400
'73 K-20 350/350/205 (sold
)
I'm kinda like duct tape- no real purpose, but handy to have around.