
Fuel lines are hoses or pipes used to transfer fuel from one point in a vehicle to another. They are a safety feature of every car and must comply with safety regulations. There are a few considerations drivers should be aware of when selecting a reliable fuel line, with minimal verification at the component level. For example, if a car has a replacement tank, it may need a built-in regulator. It's also important to secure the fuel hose so that it will not move and also be protected from heat.
| Characteristics | Values |
|---|---|
| Material | Hose or pipe |
| Function | Transfer fuel from one point to another or from a storage tank to the vehicle |
| Safety | Must comply with safety regulations |
| Isolation | Use flexible fuel hose to isolate vibration and movement |
| Heat protection | Secure the fuel hose to protect it from heat |
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What You'll Learn

Fuel lines are hoses or pipes used to transfer fuel from one point to another
When selecting a fuel line, drivers should be aware of a few considerations to ensure reliability and compliance with safety regulations. It is important to secure the fuel hose so that it does not move and is protected from heat. If the car has a replacement tank, it may have a built-in regulator. If the car does not run properly once the fuel system is plumbed, clamping the return pipe may be necessary to allow the fuel system to pressurise.
For cars used in rallying, a fuel sampling kit is required. This has a dry break coupling that allows fuel to flow once the drain hose is connected. When running hard lines, it is recommended to use a flexible fuel hose to connect at the engine and the tank. This isolates vibration and movement and makes it easier to drop the tank in the future.
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Fuel lines must comply with safety regulations
Fuel lines are hoses or pipes used to transfer fuel from one point in a vehicle to another. They are a safety part of every car and must comply with safety regulations.
The United States Environmental Protection Agency defines a fuel line as:
> all hoses or tubing designed to contain liquid fuel or fuel vapor. This includes all hoses or tubing for the filler neck, for connections between dual fuel tanks, and for connecting a carbon canister to the fuel tank. This does not include hoses or tubing for routing crankcase vapors to the engine's intake or any other hoses or tubing that are open to the atmosphere.
Thought should be given to securing the fuel hose so that it will not move and also be protected from heat. If you’re running hard lines, it’s a good idea to use around 6 inches of flexible fuel hose to connect at the engine and the tank. This isolates vibration and movement as well as making it easier to drop the tank in the future.
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Flexible fuel hoses can isolate vibration and movement
A fuel line is a hose or pipe used to transfer fuel from one point in a vehicle to another. Most vehicles have rubber fuel hoses connecting the fuel pipes on the chassis to the fuel pump or carburetor on the engine.
If the car has a replacement tank (alloy/plastic fuel cell etc) that has removed the in-tank pump, this can sometimes have a built-in regulator as well (quite common on single-point injection cars). If the car does not run properly once the fuel system is plumbed, it is worth clamping the return pipe and seeing if the car picks up and runs well. If this is the case, a regulator will need to be added to the return line to allow the fuel system to pressurise.
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Fuel sampling kits can be used to drain fuel
A fuel line is a hose or pipe used to transfer fuel from one point in a vehicle to another. The United States Environmental Protection Agency defines a fuel line as "all hoses or tubing designed to contain liquid fuel or fuel vapour". Most vehicles have rubber fuel hoses connecting the fuel pipes on the chassis to the fuel pump or carburettor on the engine.
Thought should be given to securing the fuel hose so that it will not move and also be protected from heat. If you’re running hard lines, it’s a good idea to use around 6 inches of flexible fuel hose to connect at the engine and the tank. This isolates vibration and movement as well as making it easier to drop the tank in the future.
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Fuel systems can be pressurised with a regulator
Fuel lines are a safety part of every car and must comply with safety regulations. It is important to secure the fuel hose so that it does not move and is protected from heat. If you are running hard lines, it is recommended to use a flexible fuel hose to connect at the engine and the tank. This isolates vibration and movement and makes it easier to drop the tank.
If a car has a replacement tank that has removed the in-tank pump, it may have a built-in regulator. If the car does not run properly once the fuel system is plumbed, clamping the return pipe may help the car run well. If this is the case, a regulator will need to be added to the return line to allow the fuel system to pressurise. Adjustable regulators are available to suit different needs.
For cars used in rallying, a fuel sampling kit will need to be added to the system. This can be a push-on hose type or a threaded male/male or male/female connection. The fuel sampling kit has a dry break coupling that allows fuel to flow once the drain hose is connected.
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Frequently asked questions
A fuel line is a hose or pipe used to transfer fuel from one point in a vehicle to another.
Fuel lines are usually made of rubber.
A fuel sampling kit has a dry break coupling that allows fuel to flow once the drain hose is connected. This can be used outside of rallying if a fuel drain is required.
A hard line is a rigid fuel line. It is recommended to use a flexible fuel hose to connect at the engine and the tank to isolate vibration and movement.
A regulator is used to allow the fuel system to pressurise.











































