Katerina Swanson
Fuel injection lines transfer fuel from the fuel tank to the car engine. They have been around since the 1950s, and electronic fuel injection was used widely on European cars starting around 1980. Now, every car sold in the United States from dealerships is equipped with a fuel injection system. There are three types of fuel injection lines found in modern vehicles: the return injection vapour line, the single-point injection line, and the PTFE fuel line.
| Characteristics | Values |
|---|---|
| Purpose | To transfer fuel from the fuel tank to the engine |
| Types | Return injection vapor line, single-point injection, fuel injection hose, PTFE fuel line |
| Materials | Steel, plastic |
| Resistance | Rust, heat, ozone, light, oxygen, ultraviolet radiation |
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What You'll Learn
- Fuel injection lines transfer fuel from the fuel tank to the car engine
- Fuel lines are now made of plastic, but older lines were made of steel
- Single-point injection uses one injector in a throttle body, similar to a carburettor
- Fuel injection hoses have an SAE 30R9 rating, which makes them resistant to chemicals, swelling, and permeation
- Return injection vapor lines collect any fuel that bypassed the combustion chamber and exited the engine
Fuel injection lines transfer fuel from the fuel tank to the car engine
There are three types of fuel injection lines found in modern vehicles. The return injection vapour line collects any fuel that bypassed the combustion chamber and exited the engine. This vapour line sends the raw emissions to a charcoal canister to collect the hydrocarbons and sulphur in the vapour.
Fuel lines are now made of plastic, which doesn't rust and can hold up to 750 psi. They are also resistant to chemicals, swelling, and permeation brought by gasoline, Ethanol gasoline extension, Diesel, fuel oils, and lubricants.
Single-point injection (also called 'throttle-body injection') uses one injector in a throttle body mounted similarly to a carburettor on an intake manifold. As in a carburetted induction system, the fuel is mixed with the air before entering the intake manifold.
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Fuel lines are now made of plastic, but older lines were made of steel
Fuel injection lines transfer fuel from the fuel tank to the car engine. Fuel lines are now made of plastic, which doesn't rust and can hold up to 750 psi. However, plastic fuel lines melt at lower temperatures and are not as easy to repair as metal lines.
Older fuel lines were made of steel. Steel fuel lines are cheap and strong, but they can corrode, causing fuel leaks. They are also prone to rusting, which can cause particles to form in the fuel. In hot climates, steel fuel lines can get very hot and cause the fuel to vapor lock.
Other materials used for fuel lines include rubber, aluminium, and coated steel tube. Rubber fuel lines are easy to install and typically connected using standard barbed fittings and fuel line hose clamps. Metal fuel lines are generally more durable than rubber or braided fuel lines as they are resistant to wear and tear and are not prone to cracking or deterioration.
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Single-point injection uses one injector in a throttle body, similar to a carburettor
Single-point injection (also known as throttle-body injection) uses one injector in a throttle body, which is mounted in a similar way to a carburettor on an intake manifold. In this system, the fuel is mixed with air before entering the intake manifold.
Single-point injection was introduced as a low-cost way for automakers to reduce exhaust emissions and comply with tightening regulations. It also provided better 'driveability' than carburettors, with easy starting, smooth running, and no engine stuttering.
Single-point injection was first introduced in the 1940s in large aircraft engines, where it was known as the pressure carburettor. In the 1980s, it was introduced in the automotive world, with different manufacturers using different names for the system: Throttle-Body Injection by General Motors, Central Fuel Injection by Ford, PGM-CARB by Honda, and EGI by Mazda.
Single-point injection was considered a stepping stone to the more complex multipoint system, which devotes a separate injector nozzle to each cylinder. While single-point injection is not as precise as newer systems, it meters fuel with better control than a carburettor and is less expensive and easier to service.
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Fuel injection hoses have an SAE 30R9 rating, which makes them resistant to chemicals, swelling, and permeation
Fuel injection lines transfer fuel from the fuel tank to the car engine. They have been around since the 1950s, and now every car sold in the United States is equipped with a fuel injection system.
The SAE 30R9 fuel hose is ideal for use in crankcase positive pressure ventilation (PCV) and evap lines. It has a smooth fluoroelastomer rubber inner layer and is reinforced with an embedded aramid fibre braid. It is designed for use with push-lock style fittings and should not be submerged in fuel or used inside fuel tanks.
The SAE 30R9 fuel hose has a wide temperature range, from -40F° to 302F°, and a working pressure of 300 psi. It is also ISO 9001 & IATF 16949 Certified.
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Return injection vapor lines collect any fuel that bypassed the combustion chamber and exited the engine
Fuel injection lines transfer fuel from the fuel tank to the car engine. The three types of fuel injection lines found in modern vehicles are: the supply line, the return line, and the vapor line. The return injection vapor line collects any fuel that bypassed the combustion chamber and exited the engine. This vapor line sends the raw emissions to a charcoal canister to collect the hydrocarbons and sulfur in the vapour.
Fuel injection has been around since the 1950s, and electronic fuel injection was used widely on European cars starting around 1980. Now, every car sold in the United States from dealerships is equipped with a fuel injection system. Fuel lines are designed to transfer fuel from the fuel tank to the engine.
Single-point injection (also called 'throttle-body injection') uses one injector in a throttle body mounted similarly to a carburettor on an intake manifold. As in a carburetted induction system, the fuel is mixed with the air before entering the intake manifold.
The downside to this setup is that engines get hot. When gasoline gets hot it turns into a gas. Gasoline vapour in your fuel lines is not something you generally want. Vapor lock is most likely to occur in the fuel injector lines after the flow divider, as fuel is sent to the injector nozzles to be sprayed into the intake manifold. This is because the heat from the engine cylinders and crankcase radiates outwards and up toward the fuel injector lines.
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Frequently asked questions
A fuel injection line transfers fuel from the fuel tank to the car engine.
Modern fuel injection lines are made of plastic, which doesn't rust and can hold up to 750 psi. Older vehicles, pre-1988, used steel fuel injection lines.
A return injection vapor line collects any fuel that bypassed the combustion chamber and exited the engine. The line sends the raw emissions to a charcoal canister to collect the hydrocarbons and sulfur in the vapor.
Single-point injection, also known as 'throttle-body injection', uses one injector in a throttle body mounted similarly to a carburettor on an intake manifold. The fuel is mixed with air before entering the intake manifold.
A fuel injection hose with an SAE 30R9 rating has resistance to chemicals, swelling, and permeation brought by gasoline, Ethanol gasoline extension, Diesel, fuel oils, and lubricants, with resistance to heat and ozone. PTFE fuel lines do not dissolve on chemical or solvents, swell and have a very high thermal resistance of up to 400°.
