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Fuel & Fuel Tanks
T 8 Fuel & Fuel Tanks

T8-1    Fuels:
Fuels are restricted to commercially available products as supplied by New Zealand Oil Companies.  

T 8-1-2
Fuels are permitted to contain commercially available lubricants as submitted to SNZ for identification and approval.  

T 8-1-3
Fuel blending is not permitted.  The addition of Toluene to fuels is not permitted.  The addition of material to fuel or intake air to increase available oxygen is strictly prohibited.  Such materials include, oxygen, nitros oxide, nitro methane, nitro propane, propylene oxide and nitro pane etc.

T 8-1-4
All fuel is subject to testing at any time, if fuel is found to deviate from the approved fuel specification it will be considered illegal.  

T 8-1-5
The use of incorrect or blended fuel will result in three months suspension from date of offence.

T 8-2    APPROVED FUELS:
(a)    Solo, Sidecar, Midget, TQ, Sprintcar, Minisprint, Modified Sprints, Modifieds and Saloons:
Methanol, Racing Fuel #5, Avgas, Petrol
(b)    Limited and Production Saloon, Stockcar:
Avgas, Petrol
(c)    Streetstock:
Petrol

T 8-3    FUEL DESCRIPTIONS
(a)    Methanol/Racing Fuel #5:        .7956 to .7988 @ 15 degrees 106 Motor Octane
(b)    Petrol/PULP:                .7347 to .7695 @ 15 degrees 96 Motor Octane
(c)    Avgas (Racegas):            .6695 to .6985 @ 15 degrees 100 Motor Octane

T 8-4    FUEL TANKS
T 8-4-1
All vehicles will be fitted with one fuel  tank, the tank must be fitted with an SNZ approved bayonet, screw type, or flush mount fuel cap; no radiator type caps are permitted.

T 8-4-2
All fuel tanks must be securely mounted

T 8-4-3
The fuel tank must have welded seams and fittings and constructed to a professional standard, soldered tanks and fittings are not permitted.

T 8-4-4
The fuel tank must be located behind the engine firewall.

T 8-4-5
Pressurized fuel tanks are not permitted.

T 8-4-6
All 4-wheel vehicles to have a suitable breathing system so that fuel will not escape during a roll over, Stockcar, modified, saloon, Streetstock must be further protected with a fuel air vent pipe of steel, copper or braided flexible line wrapped horizontally around the tank and extending through the vehicle to a distance of not less than 50 mm and not more than 200 mm

T 8-4-7
Fuel vent pipe must avoid inboard disc braking systems and at least 600 mm away from exhaust pipes

T 8-4-8
The addition of safety foam baffling to fuel tanks is highly recommended. NOTE; the tank will need to be filled with at least 80% foam to be effective.

T 8-4-9
Fuel tanks must be constructed and supported in a manner that will insure every possible precaution has been taken to avoid rupture or breakage. It is highly recommended that the tank has an adequate supporting structure under the lowest portion of the tank. The structure should follow the contour of the tank and be welded or bolted to the framework of the car.  A suitable upper structure fitting the contour of the tank should allow the tank to be firmly attached to the framework of the car. The practice of bolting the tank to the chassis entirely by mounting plates is not recommended.

T 8-5    FUEL TANK DIMENSIONS
T 8-5-1    Modified;
Minimum thickness 1.0 mm steel, maximum capacity 55 litres. Aluminium and aluminium alloy fuel tanks are not permitted

T 8-5-2    Stockcar and Streetstock;
Minimum thickness 1.2 mm steel, maximum capacity 22.75 litres. Aluminium and aluminium alloy fuel tanks are not permitted.

T 8-5-3    Saloon;
Minimum thickness 1.2 mm steel or 2.0 mm aluminium for up to 36 litre capacity, whereas 1.6 mm steel or 2.6 mm aluminium minimum thickness is required for up to 55 litre maximum capacity .

T 8-6    FUEL TANK LOCATION
T 8-6-1    Section 10 vehicles -
The fuel tank/tail tank confined with in the tail cone area.  
T 8-6-2    Saloons -
The fuel tank confined in the boot or rear compartment and behind the rear firewall
T 8-6-3    Modifieds -
Fuel tank  confined to the rear within the roll cage bracing or chassis.
T 8-6-4    Stockcars -
The fuel tank confined towards the rear of the roll cage, or under the floor, the tank must be protected from impact.
T 8-6-5    Streetstocks -
The fuel tank may be fitted in the boot area provided that the tank is as far forward as the rear seat frame allows. The tank and filler cap must be below the level of the upper bars. The tank must be securely attached to either the floor or the rollcage but not both.

T 8-7    FUEL CELLS
T 8-7-1
Semi rigid cross link polymer type fuel tanks, also known as fuel cells, are permitted in Midget, TQ, Sprintcar, Minisprint, Modified Sprint, Saloon, Stockcar and Modifieds.

T 8-7-2
All section 10 vehicles permitted to use semi rigid fuel tanks also known as fuel cells must be fitted with an approved collapsible insert or fuel bladder or fully protected on all sides and the bottom by 1.5 minimum alloy plate to be known as the fuel-can.

T 8-7-3
Stockcar, Saloon and Modifieds fitted with fuel cells must be protected on all sides and the bottom by a 3 mm minimum steel plate fuel-can, the use of a collapsible fuel bladder is optional.

T 8-7-4
It is highly recommended that fuel cell inserts or bladders be replaced every 5 years.

T 8-8    Fuel Cell Mountings
T 8-8-1
Fuel cells must be constructed and supported in a manner that will insure every possible precaution has been taken to avoid rupture and breakage.  There must be no bolt heads inside the fuel-can that can rupture the fuel cell.

T 8-8-2
Fuel cells must not be mounted to the chassis utilizing any portion of the access plates or the nut plate bonded into the fuel bladder if fitted.

T8-8-3
For section 10 vehicles using a semi rigid fuel cell tail tank, the front face of the cell must be mounted at the top by a minimum of three (3) 8 mm (5/16") bolts through two bars either aluminium or steel minimum 50 mm (2") x 5 mm (3/16") sandwiching the cross link polymer cell wall.

T 8-8-4
The fuel cell mounting bar can extend outside the width of the tank and attach to lugs on the rollcage verticals or alternatively, only be the width of the tank and mount on lugs attached to a tube running between the roll cage verticals on the outer two of the three bolts sandwiching the cell wall.  All other fuel cells must be mounted in two 50mm x 3mm steel straps wrapped around the cell.

T 8-8-5
At the bottom of the cell on each side a washer or plate 5 mm (3/16") inside the cell minimum of 65 mm (2.5") diameter. With a minimum of one 8 mm (5/16") bolt.  

T 8-8-6
Section 10 vehicles must have an adequate supporting structure under the forward section of the lowest portion of the fuel cell.  This structure should follow the contour of the cell and be welded or securely attached to the frame of the car on each side.

T 8-8-7
Section 10 vehicles, must not fit the fuel pick up underneath a fuel cell.

T 8-9    FUEL TAPS

T 8-9-1
The fuel line from the tank must be fitted with a shut off tap which must be in reach of the competitor while in the normal seated and restrained position and in reach of a person outside the car.  

T 8-9-2
Section 10 vehicles may have the fuel tap handle outside the cockpit.

T 8-9-3
An additional simple on/off master fuel tap must be fitted as close as practical to the outlets from the tank on all section 10 vehicles.

T 8-9-4
The on/off master tap must be fitted directly into the fuel tank on Streetstocks and Stockcars.

T8-9-5
All fuel taps must be clearly marked 'off' and 'on'.

T 8-9-6
Fuel filter bowls must be of metal construction.

T 8-10    FUEL LINES
T 8-10-1
Fuel lines must be of steel, copper, aluminium or of flexible construction.

T 8-10-2
Fuel lines, where flexible, must be of an approved flexible type, securely clamped at joints, wire clamps are not permitted.

T 8-10-3
Plastic, reinforced plastic, nylon, or reinforced nylon fuel line is not permitted.

T 8-10-4
Armoured flexible neoprene plastic is permitted where fitted as a standard OEM part.

T 8-10-5
Approved 'push-lock' fittings and hoses are permitted. (Hose identification # R6)

T 8-10-6
Fuel lines and return lines must be secured to the chassis at the fuel tap and at intervals of not more than 300 mm.

T8-10-7
Grommets are to be fitted where fuel lines pass through bulkheads etc. to prevent chafing - Modifieds, Saloons.

T 8-11
Refueling of race vehicles on the track is prohibited except for solos and sidecars.