Attwood Primer Bulb - 1/4" Inner Diameter Hose

The Attwood Primer Bulb with 1/4" inner diameter hose is an essential fuel system component designed for reliable cold-start priming on outboard motors, small engines, and fuel-injected watercraft applications. This primer bulb solves a common problem mechanics and boat owners face: inconsistent fuel delivery during engine startup, especially in cold conditions or after extended storage. Built by Attwood Marine—a trusted name in marine engine accessories—this bulb ensures fuel reaches the carburetor or fuel injector quickly and consistently, eliminating vapor lock and hard-start frustration.

The primer bulb's exclusive three-layer construction prevents structural collapse under vacuum while resisting ballooning or burst failure under high pressure cycling. The 1/4" inner diameter hose connection accommodates standard marine fuel lines and maintains a leak-free seal through durable elastomer materials engineered to withstand ethanol-blend fuel, UV exposure, and temperature extremes common in marine environments. The bulb's tactile squeeze-and-release action provides immediate feedback, allowing operators to confirm fuel flow visually and feel resistance that indicates proper system pressurization before engine ignition.

Mechanics and boat owners benefit most when replacing worn or cracked primer bulbs that leak fuel or fail to build adequate pressure for reliable starts. Installation is straightforward: disconnect the old bulb from fuel lines, slide the new unit onto 1/4" inner diameter hose sections, and secure with hose clamps if needed. This compact, lightweight component weighs only 0.3 lbs and fits easily into engine compartments or under console panels, making it an ideal replacement or upgrade for two-stroke and four-stroke outboards, jet skis, and small-displacement fuel-injected engines where consistent priming is non-negotiable for performance and reliability.