TREXFLOW TF SAE30R9 Fuel Injection Hose 5/16" ID — 5ft High-Pressure 300 psi, Ethanol-Safe

TREXFLOW TF SAE30R9 5/16" fuel injection hose is a 5-foot, high-pressure push-lock line built with a fluoroelastomer inner layer and aramid braid for reliable fuel resistance up to 300 psi.

This SAE J30 R9-rated hose is engineered for demanding fuel system applications where ethanol and aggressive fuels are present. It pairs a smooth FKM inner liner with an Epichlorohydrin outer cover and embedded aramid reinforcement to resist permeation, swelling, and hardening. The hose is sized for a 5/16" (8 mm) inner diameter, has a 0.55" (14 mm) outer diameter, and is supplied in a 5-foot length for easy routing in engines, race cars, and custom fuel systems.

How does this hose stand up to ethanol and modern fuels?

The TREXFLOW TF SAE30R9 construction minimizes fuel vapor permeation and degradation when exposed to ethanol-blended fuels, methanol, and other aggressive liquids. Its fluoroelastomer (FKM) inner layer resists chemical attack while the Epichlorohydrin outer cover protects against environmental wear.

• Ethanol-safe formulation for E10, E85 and higher blends
• Compatible with gasoline, methanol, diesel, biodiesel blends, and racing fuels
• Designed to resist permeation and maintain flexibility over time

What pressures and temperatures can it handle?

This 5/16" ID hose is rated for 300 psi working pressure with a much higher burst capability, making it suitable for many fuel injection and high-pressure return lines. The operating temperature range spans from -40°F to 300°F (-40°C to 150°C), supporting cold starts and high-heat engine bays.

• Working pressure: 300 psi; high burst margin for safety
• Temperature range: -40°F to 300°F (-40°C to 150°C)
• Vacuum rating: ~23.9 inHg (810 mbar) at 20% deflection

Can I use this with push-lock fittings and hose clamps?

The hose is manufactured for push-lock style fittings and will slide over smooth barbs for secure connections. Clamps are recommended for push-lock fittings and required when pressures exceed 10 psi or when using smooth hose barbs.

• Intended for push-lock fittings; not for cutter-style or crimp AN ends
• Use hose clamps on smooth barb fittings and when pressure >10 psi
• Not designed to be submerged inside fuel tanks

What materials and certifications back its quality?

The hose combines an FKM inner liner, aramid fiber reinforcement braid, and an Epichlorohydrin outer cover to produce a balanced set of chemical and mechanical properties. Production follows ISO 9001 and IATF 16949 quality controls to ensure consistent dimensions and performance.

• FKM inner layer for excellent chemical resistance
• Embedded aramid braid offers tensile strength and kink resistance
• Manufactured under ISO 9001 and IATF 16949 quality systems

Who this is for: Mechanics, performance tuners, custom builders, and fleet technicians who need a short run of reliable, ethanol-compatible fuel hose will find the TREXFLOW TF SAE30R9 5/16" 5-foot line useful for fuel injection routing, PCV and evap lines, and other under-hood applications. It is ideal when you require a durable push-lock hose that resists permeation from modern fuels and stands up to high temperatures and pressures—just avoid submerging it in a fuel tank and use proper clamps and fittings for safe installation.