Fuel Hose - Bulk
Representative Photo, actual item may vary
Representative Photo, actual item may vary
Seachoice 365-0386 Low Permeation Type A1-15 Marine Fuel Hose 3/8" ID x 50 ft
What Is Bulk Fuel Hose — and Why Does It Matter?
In marine and RV fuel systems, the hose connecting the tank to the engine is one of the most safety-critical components on the vessel or vehicle. Bulk fuel hose is sold by the foot or in continuous coils, letting technicians, boat builders, and DIY enthusiasts cut precisely the length they need for custom fuel feed, fill, and vent runs — without paying for pre-made assemblies or ending up short mid-project.
Unlike standard automotive fuel line, marine-grade bulk fuel hose is engineered to meet the unique demands of the on-water environment. Fuel hoses built for marine use are constructed with heavier materials and are designed to be more fire-resistant than their automotive counterparts, meeting USCG standards and specifications for Type A1 and A2 fuel lines. The innermost tube must resist fuel permeation — a particular challenge with today's ethanol-blended gasoline — while the outer cover resists ozone, UV exposure, heat, and abrasion.
Understanding USCG Fuel Hose Types
The United States Coast Guard classifies marine fuel hoses into four primary types. Knowing the difference before you buy is essential for both safety and legal compliance:
- Type A1: Designed for below-deck, fuel-feed applications where fuel is constantly present in the hose. Must resist fire for at least 2.5 minutes and comply with 33 CFR 183 for inboard gasoline machinery fuel systems.
- Type A2: Used for fuel fill hoses that connect the fill port to the tank; intended for above-deck runs and must resist fire for at least 30 seconds.
- Type B1 / B2: Suitable for vent and fill lines outside the engine compartment in lower-risk routing applications.
When shopping for bulk hose, always verify that the hose is marked with its USCG approval type — the USCG requires this marking every 12 inches along with the date of manufacture. Look for compliance with SAE J1527, ISO 7840, and NMMA standards as additional indicators of quality and safety. For vessels dealing with ethanol-blended fuels like E10, confirm the hose is rated for alcohol-blended gasoline compatibility, as ethanol can rapidly degrade fuel line components that lack proper barrier construction.
Choosing the Right Diameter
Bulk fuel hose is available in a range of inside diameters to match different engine types and fuel system demands. Common sizes include 3/8" ID for small-to-medium outboard engines, 1/2" for larger boats with higher fuel demands, and 3/4" for fuel filler neck applications. Always match hose ID to your fittings and engine manufacturer's flow requirements, and check that pressure and temperature ratings meet your specific installation conditions.
Top Brands in Bulk Fuel Hose
For reliability you can trust on the water or on the road, ContiTech is the leading name in this category. Part of the Continental family — a company that has been at the forefront of flexible hose technology in the marine environment for well over 60 years — ContiTech marine fuel hoses are engineered for fuel feed and vent applications on marine pleasure craft and meet U.S. Coast Guard and International Marine Certification Institute requirements for Type A1 service. Their dock and transfer hose lines are equally trusted in commercial port and offshore applications, with a product range spanning petroleum transfer, chemical resistance, and specialized marine environments.