Text in force at CAR3-14: from CAR3-0, effective 1 Nov 1949. OCR text
(a) Fuel tank filler connections shall be marked as specified in § 3.767.
(b) Provision shall be made to prevent the entrance of spilled fuel into the fuel tank compartment or any portions of the airplane other than the tank itself. The filler cap shall provide a fuel-tight seal for the main filler opening. However, small openings in the fuel tank cap for venting purposes or to permit passage of a fuel gauge through the cap shall be permissible.