Fuel Line Hose 5/16 ID 25ft - High-Temp Fuel Injection Hose

Our review of this 5/16 fuel line hose finds it best suited for DIY mechanics and professional tuners who need a durable, fuel-injection compatible line in a long 25ft length. The single biggest reason to buy is its certification to the SAE J30R9 standard and construction materials that make it compatible with ethanol blends and diesel, giving confidence when replacing or routing fuel lines in demanding environments. The review highlights real use benefits like high working pressure and temperature tolerance without resorting to vague claims.

Key Features

• Size and length: The 5/16 in inner diameter and full 25 ft spool provide enough hose for routing through an engine bay or for longer custom runs without extra joins.
• High pressure rating: A 300 psi working pressure and 1200 psi burst pressure mean the hose withstands fuel injection system demands and pressure spikes.
• Temperature tolerance: Rated from -40F to 275F (intermittent to 302F), it handles hot engine compartments and seasonal extremes.
• SAE J30R9 standard: Meeting and exceeding this standard ensures compatibility with 30R7 and 30R6 systems and confidence for fuel system, oil cooling, and vapor applications.
• Fuel compatibility: The FKM inner and ECO cover with aramid reinforcement accept ethanol blends such as E85, E10, biodiesel and diesel without rapid degradation.

Who It's For

This hose is aimed at automotive enthusiasts performing LS swaps, fuel pump or filter replacements, and those building or repairing fuel injection systems who need a reliable, long length of SAE J30R9 hose. The combination of a 5/16 in ID and 25 ft length makes it convenient for shop projects and custom installations that prefer a continuous run rather than joining multiple shorter sections.

Those who should look elsewhere include people needing smaller or larger inner diameters, or OEM-specific preformed lines for exact factory shapes. If you require an ultra-rigid hose for repeated push-on barbs without clamps, test fitting is advised because some users report a loose fit on certain 5/16 in barb connectors.

Pros & Cons

Pros

• Built to SAE J30R9, offering easy fit into fuel injection and related systems with confidence in material performance.
• Material construction with FKM inner and aramid fiber reinforcement provides strong chemical and heat resistance for ethanol and diesel use.
• Long 25 ft spool reduces the need for joints and gives flexibility in routing for swaps and custom installations.
• Good working and burst pressures for the class, making it suitable where higher pressures or transient spikes occur.

Cons

• Some customers report a mixed fit on 5/16 in barbs, so clamps and test fitting are recommended to ensure leak-free connections.
• The 0.55 in outer diameter requires adequate clearance and bend radius planning on tight installations.

Specifications

Inner Diameter	5/16 in (8 mm) +/- 0.4 mm
Outer Diameter	0.55 in (14 mm) +/- 0.5 mm
Length	25 ft
Working Pressure	300 psi
Burst Pressure	1200 psi
Temperature Range	-40F to 275F (intermittent to 302F)
Construction	FKM inner, ECO cover, aramid fiber reinforcement

Our Verdict

This fuel line hose is a solid value for anyone installing or repairing fuel injection systems who needs a long, SAE J30R9-compliant hose that handles ethanol blends and high heat. It combines durable materials, high pressure ratings, and a convenient 25 ft length, though buyers should verify barb fit and plan clearance for the 0.55 in OD when routing.

Frequently Asked Questions

Is this hose compatible with ethanol blends like E85?
Yes. The FKM inner compound and ECO cover are compatible with ethanol blends, E85, E10, biodiesel and diesel.

Will it work for fuel injection systems?
Yes. It meets and exceeds SAE J30R9 and is designed for fuel injection, making it suitable for fuel pumps, filters and injection lines.

Does it fit 5/16 in barbed fittings tightly?
Fit is mixed; many users report good seal and no leaks, but some experience a loose fit on certain barbs, so use clamps and test connections.