Rajan Wilcox
The NHRA Rule Book outlines specific requirements for fuel line routing in the engine compartment. These rules are in place to ensure safety and performance standards are met. The regulations cover a range of details, from the materials used to the positioning of the fuel lines.
| Characteristics | Values |
|---|---|
| Fuel lines | Must be isolated from the driver compartment by a subfloor or housing when the engine is located in the rear and the fuel tank is located in front of the driver |
| Fuel gauge lines | Must be steel braided with steel fittings |
| Fuel tanks | Must be located above the bottom frame rail |
| Fuel routing | No fuel may be routed through any frame member on any car |
| Fuel cells | Permitted |
| Maximum fuel pumps | 2 |
| Fuelpump inlet | Must be double barbed design and secured with double clamps |
| Fuel lines in the driver compartment | No fuel lines (other than gauge) can be inside the drivers compartment |
| Fuel lines in the flywheel/bellhousing area | Must be enclosed in a 16-inch length of steel tubing, 1/8-inch-minimum wall thickness, securely mounted as a protection against fuel-line rupture |
| Fuel lines in the driveshaft tunnel | Not permitted |
| Fuel lines passing supercharger drive belts | Must be steel braided, NHRA-accepted woven or woven-pushlock, or be enclosed in protective steel tubing |
| Non-OEM fuel lines | Must be metallic, steel braided, or NHRA-accepted “woven or woven-pushlock |
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What You'll Learn
- Fuel lines must be isolated from the driver's compartment by a subfloor or housing when the engine is located in the rear and the fuel tank is located in front of the driver
- Fuel lines may not be routed in the driveshaft tunnel
- Fuel lines passing supercharger drive belts must be steel braided, NHRA-accepted woven or woven-pushlock, or be enclosed in protective steel tubing
- No fuel may be routed through any frame member on any car
- Fuel cells are permitted
Fuel lines must be isolated from the driver's compartment by a subfloor or housing when the engine is located in the rear and the fuel tank is located in front of the driver
When the engine is located in the rear and the fuel tank is located in front of the driver, fuel lines must be isolated from the driver's compartment by a subfloor or housing. This is a mandatory requirement outlined in the NHRA Rule Book.
The rule book also specifies that fuel gauge lines in the driver's compartment must be steel braided with steel fittings. Pressurised fuel tanks are prohibited, and fuel tanks must be located above the bottom frame rail. No fuel may be routed through any frame member on any car.
Fuel lines (except steel braided lines) in the flywheel/bellhousing area must be enclosed in a 16-inch length of steel tubing with a minimum wall thickness of 1/8 inch. This is to protect against fuel-line rupture. Fuel lines are not permitted to be routed in the driveshaft tunnel. It is mandatory that fuel lines passing supercharger drive belts be steel braided, NHRA-accepted woven or woven-pushlock, or be enclosed in protective steel tubing.
All non-OEM fuel lines (including gauge and/or data recorder lines) must be metallic, steel braided, or NHRA-accepted “woven or woven-pushlock”. A maximum of 12 inches total (front to rear) of non-metallic or non-steel braided hose is permitted for connection purposes only; individual injector nozzle and motorcycle fuel lines are excluded.
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Fuel lines may not be routed in the driveshaft tunnel
The NHRA Rule Book states that fuel lines must be isolated from the driver's compartment by a subfloor or housing when the engine is located in the rear and the fuel tank is located in front of the driver. Fuel lines may not be routed in the driveshaft tunnel. This is to prevent fuel-line rupture.
Fuel lines in the flywheel/bellhousing area must be enclosed in a 16-inch length of steel tubing, with a minimum wall thickness of 1/8 inch. This is to protect against fuel-line rupture. It is also mandatory that fuel lines passing supercharger drive belts be steel braided, NHRA-accepted woven or woven-pushlock, or be enclosed in protective steel tubing.
All non-OEM fuel lines (including gauge and/or data recorder lines) must be metallic, steel braided, or NHRA-accepted “woven or woven-pushlock. A maximum of 12 inches total (front to rear) of non-metallic or non-steel braided hose is permitted for connection purposes only; individual injector nozzle and motorcycle fuel lines are excluded.
Fuel gauge lines in the driver's compartment must be steel braided with steel fittings. Pressurized fuel tanks are prohibited. Fuel tanks must be located above the bottom frame rail. No fuel may be routed through any frame member on any car. Fuel cells are permitted, with a maximum of two fuel pumps. Electronic or electrically-controlled system timers are permitted. Artificial cooling or heating of any fuel is prohibited. The fuel pump inlet must be double-barbed design and secured with double clamps. No fuel lines (other than gauge) can be inside the driver's compartment.
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Fuel lines passing supercharger drive belts must be steel braided, NHRA-accepted woven or woven-pushlock, or be enclosed in protective steel tubing
The NHRA rule book states that fuel lines must be isolated from the driver's compartment by a subfloor or housing when the engine is located in the rear and the fuel tank is located in front of the driver. Fuel lines may not be routed in the driveshaft tunnel.
All non-OEM fuel lines (including gauge and/or data recorder lines) must be metallic, steel braided, or NHRA-accepted “woven or woven-pushlock. A maximum of 12 inches total (front to rear) of non-metallic or non-steel braided hose is permitted for connection purposes only; individual injector nozzle and motorcycle fuel lines are excluded.
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No fuel may be routed through any frame member on any car
The NHRA Rule Book states that no fuel may be routed through any frame member on any car. This means that fuel lines cannot be routed through the driveshaft tunnel or the flywheel/bellhousing area.
Fuel lines in the flywheel/bellhousing area must be enclosed in a 16-inch length of steel tubing with a minimum wall thickness of 1/8 inch. This is to protect against fuel-line rupture.
Fuel lines passing supercharger drive belts must be steel braided, NHRA-accepted woven or woven-pushlock, or be enclosed in protective steel tubing. All non-OEM fuel lines must be metallic, steel braided, or NHRA-accepted “woven or woven-pushlock. A maximum of 12 inches total (front to rear) of non-metallic or non-steel braided hose is permitted for connection purposes only.
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Fuel cells are permitted
Fuel lines (except steel braided lines) in the flywheel/bellhousing area must be enclosed in a 16-inch length of steel tubing with a minimum wall thickness of 1/8 inch. This is to protect against fuel-line rupture. Fuel lines may not be routed in the driveshaft tunnel, and it is mandatory that fuel lines passing supercharger drive belts be steel braided, NHRA-accepted woven or woven-pushlock, or be enclosed in protective steel tubing.
All non-OEM fuel lines (including gauge and/or data recorder lines) must be metallic, steel braided, or NHRA-accepted “woven or woven-pushlock. A maximum of 12 inches total (front to rear) of non-metallic or non-steel braided hose is permitted for connection purposes only; individual injector nozzle and motorcycle fuel lines are excluded.
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Frequently asked questions
All non-OEM fuel lines must be metallic, steel braided, or NHRA-accepted 'woven or woven-pushlock'. A maximum of 12 inches total of non-metallic or non-steel braided hose is permitted for connection purposes only.
Fuel lines (except steel braided lines) must be enclosed in a 16-inch length of steel tubing, with a minimum wall thickness of 1/8 inch. This is to protect against fuel-line rupture.
Fuel lines may not be routed in the driveshaft tunnel.
