Tube series

Custom automotive plumbing starts with matching the tubing to the fluid, system pressure, temperature, routing and connection type. The Evil Energy automotive tubing collection brings together PTFE and CPE fuel tubing, SAE J30R9 fuel injection hose, conductive PTFE kits, 1060 aluminum hard line, silicone vacuum tubing and compatible connection options for EFI, carburetor, LS swap, fuel return, transmission, oil and vacuum routing. Because these products use different inner materials and fitting systems, they should not be selected by appearance or AN size alone.

Choose the material first, then confirm the actual inner diameter, length, pressure range, fluid compatibility, minimum bending radius and required fittings for the selected item. Hose only options work for builders who already have compatible ends, while line kits can reduce the work of matching hose and fittings for a new custom layout.

How Do I Choose Automotive Tubing for a Custom Build?

Tubing Type	Best Starting Point	Check Before Buying
PTFE fuel line	EFI, return line and performance fuel routing when the selected hose is rated for the fuel being used	Actual hose ID, supported fuel, bend radius and PTFE specific hose ends
Conductive PTFE fuel tubing	E85, methanol and high flow fuel systems where a conductive inner liner is required	6AN, 8AN or 10AN size, 10FT or 20FT length and included fitting configuration
CPE fuel line	Flexible routing for compatible fuel, oil, transmission fluid, hydraulic fluid and vacuum applications	Fluid compatibility, pressure rating by size, temperature and CPE compatible fittings
SAE J30R9 fuel injection hose	EFI and LS swap routing that requires flexible 1/4, 5/16 or 3/8 inch fuel hose	Hose ID, barb compatibility, clamp type, required length and routing temperature
1060 aluminum fuel line	Clean, rigid 25FT fuel, return, transmission oil, automotive AC or air routing	5/16 or 3/8 inch tube OD, fitting size, bending path and flexible transitions near moving components
Silicone vacuum tubing	Automotive vacuum and air signal routing in the listed tubing sizes	Port diameter, routing length and approved medium; do not treat vacuum tubing as fuel hose

PTFE hose is relatively firm and requires dedicated PTFE hose ends. CPE tubing offers a different balance of flexibility, pressure capability and fluid compatibility. Aluminum hard line is useful for long, orderly chassis runs but requires proper cutting, deburring, bending and tube specific connections. It must not be used as pressurized brake line.

What Should I Check Before Routing Fuel Tubing?

A clean installation depends on the complete flow path, not the tubing alone. Check the tank outlet, pump, filters, regulator, rail or carburetor ports and return connection before choosing a diameter. The narrowest hose, fitting or adapter in the path can become a restriction even when the main line uses a larger AN size.

Confirm the medium: Verify gasoline, diesel, ethanol blend, E85, methanol, oil, coolant or vacuum compatibility for the exact tubing selected.
Confirm actual dimensions: Compare hose ID or tube OD rather than assuming that every product with the same AN label has the same internal passage.
Match the fitting system: PTFE, CPE, push lock, barb and hardline connections use different retention and sealing methods. Use hardline fittings designed for the selected tube size when transitioning to an AN system.
Map the route before cutting: Allow for engine movement, suspension travel and service access. Keep the line away from exhaust heat, sharp edges and rotating components.
Support the line: Use suitable clamps, separators, bulkhead fittings or grommets from the hose and tube management range to reduce abrasion and vibration.
Inspect the completed system: Check fitting engagement, hose bend radius, clearance and every connection under the system’s intended operating pressure before driving.

For a broader explanation of fuel, oil, coolant and vacuum line materials, review the Evil Energy automotive hoses and fittings guide before finalizing your layout.

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What Type Of Automotive Tubing Should I Use For A Custom Fuel System?

Choose according to the fluid, operating pressure, temperature, required flexibility and fitting system.

PTFE fuel tubing is a strong starting point for EFI, return and ethanol fuel applications when the selected product explicitly lists the fuel being used. It is relatively firm and requires PTFE specific hose ends.

Conductive PTFE tubing adds a conductive inner layer for applications such as E85 or methanol systems where static dissipation is required.

CPE fuel line is useful when flexible routing is a priority, but its approved fluids, pressure and temperature must be checked for the exact hose.

SAE J30R9 fuel injection hose is designed for flexible EFI fuel routing and is available from Evil Energy in 1/4, 5/16 and 3/8 inch inner diameters.

Aluminum hard line is suitable for long, rigid chassis routes when the listed fluid and pressure match the application. Silicone vacuum tubing should remain in vacuum or air service unless fuel compatibility is explicitly stated.

How Do I Choose The Correct Fuel Tubing Size For An EFI, Carburetor Or Return System?

Do not choose the size from horsepower or AN designation alone. Determine the required fuel flow, then check the pump outlet, filters, regulator, fuel rail or carburetor inlet and return port. The complete route should avoid an unintended restriction at a smaller fitting or adapter.

Compare the product’s actual inner diameter because two hoses with the same AN label can have different internal passages when their liner and reinforcement structures differ. Also account for line length, fuel pressure, pump design and whether the system uses a return line. Follow the fuel system or engine manufacturer’s sizing requirement when one is provided.

Is All Automotive Fuel Tubing Compatible With Gasoline, E85, Methanol, Diesel And Oil?

No. Fluid compatibility must be confirmed for the exact tubing rather than inferred from its appearance.

Evil Energy offers PTFE, conductive PTFE, SAE J30R9 and aluminum products that list specific ethanol or E85 applications. That does not make every CPE, rubber, vacuum or braided hose compatible with the same fluids. Also check whether the hose is approved for internal fuel exposure only or for full submersion inside a tank; those are different conditions.

If a fuel is not listed for the selected tubing, do not assume that the inner liner, reinforcement and fittings can tolerate it.

Should I Use Aluminum Hard Line Or Flexible Braided Fuel Tubing?

Aluminum hard line is useful for long, orderly runs along a chassis because it holds its shape and can reduce the amount of flexible hose required. It must be cut square, deburred, bent without flattening and connected with fittings designed for its tube outside diameter. It must not be used for pressurized brake lines.

Flexible braided fuel tubing is more suitable near the engine, pump, tank or other areas where vibration, powertrain movement or service access must be accommodated. Many custom systems use rigid tubing for the main chassis route and short flexible transitions at moving components.

How Do I Install Performance Automotive Tubing Without Kinks, Abrasion Or Fuel Leaks?

Plan the complete route before cutting. Respect the published minimum bending radius, keep the line away from exhaust heat, sharp edges, rotating shafts and suspension travel, and allow enough movement at the engine and tank.

Use hose ends designed for the exact inner material. PTFE fittings, CPE fittings, barb connections and hardline compression fittings are not automatically interchangeable. Secure the route with suitable clamps and use grommets or bulkhead fittings where the line passes through a panel.

AN flare connections seal at the flare seat rather than at the threads. Thread sealant should not be applied to the AN flare sealing surface. Use a suitable sealant on tapered pipe threads only when specified. After assembly, inspect every connection under the system’s intended pressure before driving.

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Tube series

How Do I Choose Automotive Tubing for a Custom Build?

What Should I Check Before Routing Fuel Tubing?

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