1967 NASCAR International Stock Car Racing Rule Book NASCAR Grand National Championship Circuit Section 20-26 -- Fuel and Fuel Cells

a. Fuel cells mandatory. Gasoline only as fuel. NASCAR reserves the right to have all cars use the same brand gasoline.

b. Fuel cell maximum capacity 22 gallons, including filler spout. Fuel cell must be encased in a (9x17x33) container (see diagram on rear pages of rule book) of no less than 20 gauge steel, divided into two compartments--a top half and bottom half--whose dimensions are as near equal as possible. (Fuel cell must be fitted within the container so that the maximum capacity, including filler spout, will not exceed 22 gallons. Violation of this specification will call for immediate disqualification of car, plus a fine, and confiscation of ilegal parts.)

(1) Fuel cell and container may be fastened to the floor or recessed as shown in diagram on rear pages of Rule Book.

(2) Fuel cell to be installed as far forward as possible in trunk comaprtment.

(3) Fuel cell, whether installed on trunk floor or in recessed well, must be secured with steel straps, not less than two lengthwise and two crosswise.

(4) No rags or stuffing permitted to make fuel cell meet 22 gallon capacity. Any materials used to bring fuel cell to 22 gallon capacity must be of steel and welded in.

(5) One 1-inch maximum vent to outside of body at left rear light. (Left hand fill only). 1-inch drain pipe at filler neck spount. Standard production size filler neck, not to exceed 2 1/4 inches outside diameter.

(6) Either or both right or left side pickup in fuel cell may be used.

(7) All fuel cells must be equipped with removable drain plug; otherwise they will be removed for inspection.

c. Firewall of steel not less than 20 gauge thickness must go between trunk and driver.

d. Electric fuel pumps not permitted.

e. No water cooling permitted on fuel pump.

f. No additional lines may be used on fuel system.

g. Fuel lines from cell to carburetor may be relocated to prevent vapor lock, but must remain under floor of car. Line may be replaced with neoprene hose not to exceed 1/2 inch I.D. Only one fuel line permitted from fuel cell to fuel pump. All fuel lines must be approved by NASCAR. Extra fuel lines or cells, concealed or otherwise, are prohibited.

h. No pressure system allowed.

i. Fuel cell vent pipe check valves are compulsory. Check valves and fuel cell must be approved by NASCAR.

j. Positively no electric motors permitted in trunk compartment.

k. No icing or cooling of fuel permitted in garage, pit or racing area.