I don't know if you can cap it off since its a non-vented fuel system,mine is still open return line is under the steering column and works fine,seems a one way check valve might be the ticket.I don't know if you can plug it off and get a vented gas cap either.
------------------
Bob West
1972 Malibu 454+.030
350 turbo-3.73's
in street trim(radial tires)
12.81 @ 107.06 (2.02 60 ft.)
------------------
Bob West
1972 Malibu 454+.030
350 turbo-3.73's
in street trim(radial tires)
12.81 @ 107.06 (2.02 60 ft.)
