Every time I filled the tank I'd have fuel splashing on the side of the car. I think I finally solved it!
I'm using a custom fuel tank with a straight fill tube about 2" in diameter and 16" long connected to the FFR provided fuel filler cap. The tank has a flat top with the fittings at the top of the front edge.
A few things might have contributed to this but I figured it mostly boiled down to no venting in the fuel fill tube, even though the tank is well vented. I took a cue from my Mustang's filler neck and a long ago post by forum member Oxide and built a tube within a tube for my fuel fill.
Untitled by
Team Limer, on Flickr
This assembly fits in my fuel fill tube just below the cap. The fuel nozzle fits inside a nipple welded to the plate and fuel flows into the tank through the attached fuel-safe hose. The area in the filler neck outside the hose serves as a vent for the filler neck.
I've done two tank fills with the nozzle at full squeeze with no splash back. Yay!!!