Used Mercury air injector, part identification 8M0021551. $110.00 each, sold individually. Each purchase is for one injector.
Part details
Brand: Mercury Marine
Condition: Used
Component: air injector for an OptiMax direct-injection system
Part identification supplied: 8M0021551
Electrical connection: integral plug connector, shown in the photos
Sealing: injector has O-ring sealing surfaces; inspect seals and use the correct installation seals for your engine
Included: one air injector as pictured; four photos show its appearance and connections
Fitment guidance
Confirm this older injector identification against your original injector and a Mercury engine serial-number parts lookup. Air injectors and fuel-rail injectors are distinct components; match the correct component before ordering.
Mercury's current air-injector listing 8M6001744 covers selected 1.5L OptiMax 75–125 HP and selected XS/Pro XS OptiMax and jet applications. That information is a reference to the air-injector product family, not confirmation that this used 8M0021551 fits every application of 8M6001744. The exact replacement chain and serial-number fitment must be checked before purchase.
