Yamaha O-Ring – 93210-29198-00 is the quiet guardian of your fuel system. Molded from rust-red Viton® and trimmed to a precise 29 mm inner diameter with a slim 2 mm cross-section, it drops cleanly into the high-pressure pump on F75–F150 four-strokes, sealing out air while holding that 50-psi rail steady. Salt spray, ethanol blends, mid-summer engine-bay heat—this little ring shrugs them off so cold starts stay crisp and idle stays glass-smooth.

Why stash a couple in the spares kit?

• Fuel-rated Viton compound resists swelling from E10 and other bio-blends

• OEM geometry seats first try—no twisting, trimming, or dribbling sealant

• Rust-red color stands out when you’re elbow-deep in the pump housing

• Supersedes 93210-30682 and fits a broad lineup of 75-150 hp outboards dating back to 1999

Swap it any time you break the pump flange or notice a pressure dip. Ten minutes, one tiny ring, and you’ve dodged the headache of fuel leaks or vapor lock miles from the launch ramp.

• Supersessions
  93210-30682-00