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IC.5.4.1 All Fuel Tanks must have a Fuel Filler Neck which must be:
a. Minimum 35 mm inner diameter at any point between the Fuel Tank and the Fuel Filler cap
IC.5.4.2 The portion of the Fuel Filler Neck nearest to the Fuel Filler cap must be:
a. Minimum 125 mm vertical height above the top level of the Fuel Tank
b. Angled no more than 30° from the vertical
IC.5.4.3 The Fuel Filler Neck must be accompanied by a clear fuel resistant sight tube for reading the fuel level which must be:
a. Visible vertical height: 125 mm minimum
b. Inside diameter: 6 mm minimum
c. Above the top surface of the Fuel Tank
IC.5.4.4 A clear Fuel Filler Neck tube may be used as a sight tube, subject to approval by a Rules Question or technical inspectors at the event.
IC.5.4.5 Fuel Level Line - A permanent, non movable fuel level line must be located between 12 mm and 25 mm below the top of the visible portion of the sight tube.
This line will be used as the fill line for the Tilt Test, and before and after Endurance to measure the amount of fuel used during the Endurance Event.
IC.5.4.6 The sight tube and fuel level line must be clearly visible to two individuals (one to fill the tank, the other to visually verify fill) without the need of assistance (artificial lighting, magnifiers, etc) or the need to remove any parts (body panels, etc).
IC.5.4.7 The individual filling the tank must have complete direct access to the filler neck opening with a standard two gallon gas can assembly.
The gas can is minimum 25 cm wide x 25 cm deep x 35 cm high, with a 25 cm spout at the top
IC.5.4.8 The filler neck must have a fuel cap that can withstand severe vibrations or high pressures such as could occur during a vehicle rollover event