Five Oceans fuel line primer bulb 3/8-inch Large — EPA/CARB approved, E85 compatible

The Five Oceans 3/8-inch universal fuel line primer bulb (FO-4279) is a large, multi-layer marine primer bulb designed to reliably prime outboard engines while meeting EPA and CARB low-permeation requirements.

This primer bulb is built for boating environments where a dependable fuel feed and regulatory compliance matter. It fits 3/8-inch inside-diameter fuel lines, comes with barb connectors and stainless-steel clamps, and accepts modern fuels including gasoline blends up to E85, diesel, and biodiesel. The construction focuses on reduced vapor permeability, weather and UV resistance, and simple installation so you can restore fuel flow quickly and confidently.

How does the Five Oceans primer bulb improve starting an outboard motor?

By creating a manual suction and push that draws fuel from the tank to the engine, the bulb eliminates air pockets and re-primes systems that have lost pressure. Its larger diameter and multi-layer design deliver faster fuel transfer than smaller bulbs, reducing the number of strokes needed to fill the line.

• 3/8" inside diameter for higher fuel volume per squeeze
• Low-permeation layers to minimize vapor loss and maintain pressure
• Barbed fittings and clamps included for a secure, leak-free connection

Is this primer bulb compatible with modern fuel blends and marine conditions?

Yes — materials and seals were chosen for compatibility with gasoline containing up to 85% ethanol (E85), diesel, and biodiesel blends, as well as resistance to saltwater, sunlight, and temperature changes. The bulb’s marine-grade rubber reduces swelling and deterioration when exposed to varied fuels and outdoor storage.

• Compatible with gasoline up to 85% ethanol, diesel, and biodiesel
• UV- and weather-resistant rubber compounds extend service life
• Stainless-steel clamps prevent corrosion in marine environments

How do I install and maintain the FO-4279 primer bulb?

Installation is straightforward: cut the fuel line to size, push the hose onto the barbed connectors, and tighten the included stainless-steel clamps. Routine maintenance involves visual checks for cracking, hardening, or leaks, and replacing the bulb if you suspect compromised performance or visible damage.

• Push fuel hose onto barbs and secure with supplied stainless clamps
• Check for firmness and cracks before each season or after long storage
• Replace if leaks, soft spots, or excessive swelling appear

Does the FO-4279 meet environmental and safety regulations?

The FO-4279 has been engineered to comply with EPA low-permeation standards and is CARB approved, helping reduce fuel vapor emissions compared with non-certified bulbs. That makes it a suitable choice for boaters who need compliant replacement parts in regulated waters.

• EPA-certified low-permeation construction
• CARB-approved for use in regulated regions
• Designed to limit vapor loss and meet emissions-focused requirements

Who is this for? The Five Oceans FO-4279 primer bulb is aimed at recreational boat owners, professional anglers, charter operators, and marine technicians who need a durable, regulation-compliant replacement for 3/8" fuel lines. It’s suited for anyone using ethanol-blended fuels or operating in areas that require EPA/CARB-approved components and for those who want a straightforward install with long-term weather resistance.