Direct answer: If you need a reliable outboard motor gas tank hose, look for universal fuel line assemblies with the right inner diameter (commonly 5/16″ or 8 mm), durable rubber or nylon braided construction, a primer bulb, stainless steel clamps, and compatible end fittings. The top picks below suit boats, RVs, and small engines, each chosen for compatibility, material quality, and practical features like anti-evaporation properties and easy installation. See the quick compatibility table to compare key specs before you buy.
Buyer snapshot: These products suit different use cases. First-time boat owners may prefer a complete kit with primer bulb and clamps. Those upgrading a legacy setup might seek universal, low-permeation lines. Anglers and weekend sailors benefit from clear-flow designs and robust fittings. The following table highlights five strong choices chosen for versatility, durability, and straightforward installation.
| Product | Length / Size | Best For | Notes |
|---|---|---|---|
| Tnisesm 5/16″ 6FT Fuel Line Assembly | 6.88 ft total; 5/16″ (8 mm) ID | Marine outboard engines on boats; RVs | Includes connector, primer bulb, and 304 stainless clamps |
| Universal 5/16″ 8mm Fuel Line Assembly with Primer Bulb | 6 ft; 5/16″ (8 mm) ID | Universal marine and RV fuel lines; ethanol blends | Low permeation material; broad compatibility |
| BARTOO 3/8″ Nylon Braided Fuel Line with Primer Bulb | 6 ft; 3/8″ (9.5 mm) ID | Marine boats, RVs, tractors; universal fit | Includes 360° stainless clamps; primer bulb included |
| BARTOO 5/16″ Nylon Braided Fuel Line for Yamaha Outboards | 7 ft; 5/16″ (8 mm) ID | Yamaha outboards; general marine use | 360° clamps; universal line, no engine fittings included |
| Marsrut Fuel Line Hose with Connector | 7.4 ft; 5/16″ (8 mm) ID | Marine boats and RVs seeking a complete hose kit | Primer bulb included; steel clamps; caution about fitment |
Tnisesm 5/16″ 6FT Fuel Line Assembly
The Tnisesm kit uses a 5/16″ (8 mm) nitrile rubber fuel hose with a snap-on connector, a rubber primer bulb, and 304 stainless steel ear clamps. This 6.88 ft assembly is designed for outboard motors and RV fuel systems. Best for buyers who want a straightforward, complete line with robust clamps. Choose this if you need a compact, all-in-one package that emphasizes corrosion resistance and a secure seal.
Best for: New installations or upgrades on small to mid-size boats where a complete kit with clamps and a primer bulb speeds up setup. Limitation: Rubber components require protection from direct sunlight and high heat to prevent material degradation over time.
Universal 5/16″ 8mm Fuel Line Assembly with Primer Bulb
Featuring a universal 6 ft line with 5/16″ ID (8 mm) and an anti-evaporation-friendly, low permeation material, this kit is compatible with ethanol-blended fuels. It includes a primer bulb and stainless clamps. Best for: Owners seeking broad compatibility across boats, RVs, tractors, and more, especially where ethanol fuels are common. Caution: Some installations may require additional fittings not included in the kit.
BARTOO 3/8″ Nylon Braided Fuel Line with Primer Bulb
This 6 ft, 3/8″ (9.5 mm) nylon braided line includes a primer bulb and 360° stainless steel hose clamps. It is compatible with ethanol-blended fuels and aims to minimize evaporation. Best for: Users who want a stronger, braided line with reinforced durability for higher flow demands. Limitation: Engine or tank fittings are not included; verify fitment for your specific engine model.
BARTOO Marine Boat Fuel Line Assembly, 5/16″ 8mm
This 7 ft, 5/16″ (8 mm) nylon braided line includes a primer bulb and stainless clamps, designed for universal marine use. Best for: Yamaha and other outboards requiring a robust, long hose with secure clamping. Caution: It is a universal line and does not include engine or tank fittings, so check compatibility with your existing fittings.
VEVOR Marine Tank with Hose and Gauge
Although not a pure hose kit, the VEVOR marine tank provides a 9.8 ft hose, a gauge, and a 6.34-gallon portable design. Best for: Those who need an integrated fuel storage and transfer system with simple monitoring. Limitation: The kit emphasizes fuel storage and transfer rather than solely a hose assembly for engine connection.
Marsrut Fuel Line Hose with Connector
Marsrut offers a 7.4 ft fuel line with 5/16″ ID and a primer bulb, plus steel hose clamps. Best for: Buyers who want a longer hose length with a ready-to-use kit that supports multiple marine applications. Caution: Always verify compatibility with your specific fuel system and tank fittings before ordering.
Buying Guide
What size should you choose?
Most outboard engines use 5/16″ (8 mm) ID hoses for standard fuel lines, while some higher-flow or older setups may use 3/8″ (9.5 mm). Match the hose ID to your engine’s inlet/outlet fittings and ensure clamps fit the hose diameter.
Should you pick a braided nylon or rubber hose?
Rubber hoses are flexible and affordable but can degrade with heat and UV exposure. Nylon braided hoses offer higher durability and abrasion resistance, especially on deck where hoses may flex or rub. For ethanol-blended fuels, select low-permeation materials to reduce fuel evaporation.
Is a primer bulb necessary?
A primer bulb helps start the fuel flow and maintains consistent fuel delivery when the engine is cranked. Kits with a primer bulb are often easier for users who don’t want to assemble multiple components separately.
What about clamps and fittings?
Stainless steel clamps reduce corrosion risk, especially in saltwater environments. Ensure the kit includes clamps or purchase compatible ones separately if needed. Some kits do not include engine or tank fittings, so verify compatibility with your equipment.
What installation considerations matter?
Inspect the hose for sunlight exposure, heat sources, and direct impacts. Do not store hoses in direct sun for long periods, and replace damaged lines promptly. Verify the flow direction if a unidirectional flow indicator is present on the connector.
Frequently Asked Questions
- Q: What hose size is most common for outboard fuel lines?
A: The 5/16″ (8 mm) inner diameter is the most common for many marine engines, with 3/8″ (9.5 mm) used in some higher-flow setups. - Q: Do these kits include engine fittings?
A: Many universal kits do not include engine or tank fittings; verify compatibility with your specific model and fittings. - Q: Can I use ethanol-blended fuels with these hoses?
A: Yes, many hoses are designed for ethanol-blended fuels, but check the product’s material specification and permeation rating. - Q: Are primer bulbs essential for all setups?
A: Primer bulbs improve startup and fuel flow consistency, especially on systems with longer hoses or older engines. - Q: How should I store fuel hoses to maximize longevity?
A: Store away from direct sunlight, heat sources, and rough environments. Keep hoses clean and inspect for cracks or hardening before reuse. - Q: What’s the key factor when choosing between rubber and braided hoses?
A: Durability and exposure conditions. Braided hoses resist abrasion and UV better, while rubber hoses are more economical for short-term or casual use.