Sylvie Willis
The size of a fuel line is important, as it needs to be large enough to flow the required amount of fuel to feed the engine. A larger diameter is generally better, but the correct diameter is the best choice. If the diameter is too small, you won't be able to support your horsepower goal, and if it's too big, the lines will take up too much space. There are many factors that can dictate fuel line size, including horsepower goals, fuel types and flow requirements.
| Characteristics | Values |
|---|---|
| Diameter | A larger diameter is generally better, but the correct diameter is the best choice. If the diameter is too small, you won't be able to support your horsepower goal. |
| Horsepower | A 3/8 line (#6) is plenty big for EFI. 700 hp needs 350 lbs/hour of fuel which is basically 60 gallons per hour. |
| Fuel type | Fuel line size depends on the type of fuel. For example, an 8AN feed line and 6AN return line on a 1000 horsepower gasoline or race gas-powered LS with 30psi is sufficient. |
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What You'll Learn
Fuel line diameter
The fuel line diameter you need depends on several factors, including the horsepower of your engine and the type of fuel.
A larger diameter is generally better, but the correct diameter is the best choice. If the diameter is too small, you won't be able to support your horsepower goal. If the diameter is too big, the lines will take up valuable space and add unnecessary weight.
For example, a 3/8 line (#6) is plenty big for EFI. If you have 700 hp, you need 350 lbs/hour of fuel, which is basically 60 gallons per hour. You can use a flow rate calculator to determine the correct fuel line diameter for your needs. There are also flow rate charts on the web that show you what line size you need for how many GPH.
You can also undersize fuel lines, but the return line must be large enough to flow the required amount to feed the engine and allow a fuel pressure regulator to do its job.
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Fuel flow requirements
The size of the fuel line you need will depend on the fuel flow requirements of your engine. The feed line and the return line must be large enough to flow the required amount to feed the engine. A larger diameter is generally better, but the correct diameter is the best choice. If the diameter is too small, you won't be able to support your horsepower goal. If the diameter is too big, the lines will take up unnecessary space.
For example, a 3/8 line (#6) is plenty big for EFI. 700 hp needs 350 lbs/hour of fuel, which is basically 60 gallons per hour. You can use a flow rate calculator to determine the line size you need for how many GPH. There are also flow rate charts on the web that show you what line size you need for how many GPH.
Another example is an 8AN feed line and 6AN return line on a 1000 horsepower gasoline or race gas-powered LS with 30psi, which is sufficient.
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Fuel type
The size of the fuel line you need depends on several factors, including the type of fuel and flow requirements.
The fuel line must be large enough to flow the required amount to feed the engine. The return line is important for allowing a fuel pressure regulator to do its job. A larger diameter is generally better, but the correct diameter is the best choice. If the diameter is too small, you won't be able to support your horsepower goal. If the diameter is too big, the lines will take up more space and may not fit properly.
For example, an 8AN feed line and 6AN return line on a 1000 horsepower gasoline or race gas-powered LS with 30psi is sufficient.
You can also use a flow rate calculator to determine the size of the fuel line you need. For instance, 700 hp needs 350 lbs/hour of fuel, which is basically 60 gallons per hour. You can look up a flow rate calculator online for 60 gph in a 3/8 tube and see that it is well below the critical velocity. There are also flow rate charts on the web that show you what line size you need for how many GPH.
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Horsepower goals
For example, an 8AN feed line and 6AN return line are sufficient for a 1000-horsepower gasoline or race gas-powered LS with 30psi. A 3/8 line (#6) is plenty big for EFI. If you need 700 hp, you will need 350 lbs/hour of fuel, which is basically 60 gallons per hour. You can use a flow rate calculator to work out the size of the fuel line you need.
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Fuel pressure regulator
The size of the fuel line you need depends on the horsepower goals and the fuel type. For example, an 8AN feed line and 6AN return line on a 1000 horsepower gasoline or race gas-powered LS with 30psi is sufficient.
The fuel line diameter also matters a lot. A larger diameter is generally better, but the correct diameter is the best choice. If the diameter is too small, you won't be able to support your horsepower goal. If the diameter is too big, the lines will take up too much space.
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Frequently asked questions
You will need an 8AN feed line and a 6AN return line.
A 3/8 line (#6) is plenty big for EFI.
You will need a fuel line with a diameter that can support 350 lbs/hour of fuel, or 60 gallons per hour.
Yes, but the return line must be large enough to flow the required amount to feed the engine and allow a fuel pressure regulator to do its job.
Yes, a larger diameter is generally better, but the correct diameter is the best choice. If the diameter is too small, you won't be able to support your horsepower goal.
