1966 CJ5, 225 V6, relocated 1979 rear tank, 3 line pump with return to tank. Crank, Crank, Crank if Jeep has been sitting for more than a day. When at gas stations it can hear/feel the air getting sucked in when I loosen the cap. Yes I deleted the vent when I put it together. I was thinking of just drilling a tiny hole in the cap. Any better (easy) solutions?