Well, I purchased a Fuel Safe fuel cell with the standard fill option for my 1966. I can get a modified fuel neck from Fuel Safe, but would rather not dump $170+ into something I could probably fabricate. Anyone ever make their own vent return into the filler neck? Any suggestions? Pictures? Also, and specs on what size fittings I would need? BTW, this is for the 16 gallon Procell

 

I didn't vent back into the filler, but if you look close you can see where I vented outside to the fender well from the ROLL OVER VALVE.

I brought the line above the filler before bringing it back down to the fender well.

I haven't filled at a gas station yet, but it should work fine, at least it does in my mind...

I made all of the stuff from exhaust tube.