Attwood Primer Bulb - 3/8" Inner Diameter Hose

The Attwood Primer Bulb - 3/8" Inner Diameter Hose is an essential fuel system component for boat owners and marine engine enthusiasts who rely on consistent fuel delivery. This manual priming bulb is engineered to draw fuel from the tank into the carburetor before engine startup, eliminating vapor locks and ensuring reliable cold-start performance. Whether you operate a recreational fishing boat, cruiser, or small outboard-powered vessel, this primer bulb restores confidence to your pre-ignition sequence and reduces starting delays on the water.

Manufactured by Attwood Marine—a trusted name in marine fuel and engine systems—this primer bulb features a 3/8" inner diameter hose connection that integrates seamlessly with standard marine fuel line configurations. The durable bulb design uses flex-resistant material that withstands repeated manual pumping without cracking or losing elasticity, while the internal check valve prevents fuel backflow and maintains system pressure. The compact 5 x 3 x 7 inch form factor and lightweight 1.3 lb construction make installation and replacement straightforward on most recreational vessels without requiring extensive tools or expertise.

This component is ideal for any boater performing routine maintenance, upgrading aged or cracked primer bulbs, or installing replacement fuel system parts after seasonal storage. The 3/8" inner diameter accommodates standard marine fuel hose sizing used across carbureted outboards, inboards, and auxiliary engines from the 1980s through modern recreational models. Before purchase, verify that your existing fuel line employs 3/8" inner diameter hose; measure the interior of your current line or consult your engine manual to confirm compatibility and ensure proper fit during installation.