Attwood Primer Bulb - 5/16" Inner Diameter Hose

The Attwood Primer Bulb with 5/16" inner diameter hose is an essential fuel system component for small-engine marine and powersports equipment. This primer bulb serves a critical function: it manually draws fuel from the tank into the carburetor before engine startup, reducing cold-start frustration. Whether you're maintaining an outboard motor, jet ski, or small-displacement watercraft engine, a functioning primer bulb directly impacts starting reliability and overall fuel system efficiency.

The 5/16" inner diameter hose connection ensures compatibility with standard fuel line sizes commonly found in marine applications. The bulb itself is engineered from durable elastomer material designed to withstand repeated compression cycles, UV exposure, and the corrosive effects of ethanol-blended fuel and saltwater environments. This design allows fuel to flow in one direction during compression and prevents backflow, maintaining consistent fuel delivery to the carburetor during the priming sequence.

Technicians and boat owners who regularly service aging or stored watercraft benefit most from carrying a replacement Attwood Primer Bulb in their maintenance kit. Original equipment bulbs degrade over time, making it crucial to have a reliable replacement on hand for optimal performance. This primer bulb is an excellent choice for enhancing the efficiency of your marine fuel system.