If your talking about a TF truck, the small line on the filler neck is an air vent to allow air to escape the tank while filling it up, it's not an overflow drain. You need to allow for expansion.
Mike B
Mike Boteler
1956 Chevy 3100 Resto Rod 1952 Willys M38 Army Jeep 1983 Jeep CJ7 Laredo 1984 Jeep CJ7 +++++ Silver Spring, MD
