Trident Marine 5/16" x 50' Boxed Low Permeation Type A1-15 Fuel Line Hose - Black

The Trident Marine 5/16" x 50' Boxed Low Permeation Type A1-15 Fuel Line Hose is engineered for serious boaters and marine engine operators who demand reliability in fuel delivery systems. This hose is built to handle both gasoline—including ethanol blends up to E85—and diesel fuel, including biodiesel blends up to B100, making it a versatile choice for modern and legacy marine powerplants. Whether you're running a center console, cruiser, or work boat, fuel line integrity directly impacts engine performance, safety, and longevity.

This hose features a barrier-lined construction with low permeation technology, which significantly reduces fuel vapor escape and fuel oxidation—critical factors that extend fuel system life and maintain EPA compliance. The 5/16-inch inner diameter is the marine industry standard for mid-range fuel delivery applications, and the 50-foot length accommodates installations from transom-mounted tanks to remote fuel storage configurations. Trident's A1-15 specification ensures the hose meets stringent SAE and USCG standards for fuel containment, fire resistance, and age resistance, meaning it won't degrade prematurely from UV exposure, saltwater spray, or temperature cycling—common stressors on the water.

This fuel line hose is ideal for replacement and new-build projects on gasoline or diesel inboards, outboards, and auxiliary systems. The 50-foot boxed length allows you to cut and terminate sections for custom routing without waste, and the black exterior resists UV degradation while remaining visually discrete in engine compartments. Installation requires SAE J30R7 or equivalent fuel line fittings (sold separately), and the hose should be routed away from exhaust components and engine heat sources. Proper sizing and secure clamping at both ends ensure leak-free operation and safe fuel delivery for thousands of hours on the water.