A Good Day Turned Bad

Oldmanmopar said

Put a vent/overflow tube on the fill tube neck right below the cap copy the 70 style run it back down the fill tube and under the floor.

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^^Exactly what I was getting at earlier^^

The charcoal system "can" maintain some pressure in the tank. The (proper) camp that goes with the evap system is a "pressure/ vacuum" cap meaning it will "blow off" if needed, either for pressure or vacuum. With the earlier system, there is NO pressure, as the vent IN THE FILLER NECK is always open to relieve any pressure, and ACTS AS A SIPHON to keep liquid below the level of the cap

I realize "too little too late" DAMN I'd be pissed!!