Sierra 18-8005EP-1 EPA Primer Bulb 3/8

The primer bulb is the part nobody thinks about until it goes hard or stops holding prime at the ramp. This one runs 3/8 in fuel line, uses double check valves with viton balls on stainless springs, and is built from FKM fluoroelastomer so it stays pliable against modern ethanol fuel instead of turning into a rock in two seasons.

• 3/8 in inside diameter for 3/8 in fuel line
• Large capacity bulb
• Double check valves with viton balls and stainless steel springs
• FKM fluoroelastomer body for traditional feel and operation
• 7.5 in overall length including the barbs
• EPA and CARB certified, per Sierra

Install it with the arrow pointing toward the engine and keep the bulb above the fuel line low point. A bulb mounted upside down will fight you every time you prime.