Some birds had a vent line from the fuel pump to the tank. My 400 did and some others got them. Not sure what qualifies which got them. Maybe only 400 and AC cars. Not sure. Maybe yours had it. Not sure with 67's.
If you have a vent line at the sending unit. You could: A) change fuel pump to have a vent line and run line to vent B) chane sending unit to not have vent C) cap of sending unit vent
