MERCURY GASOLINE STARTER 8168773

Function and technical context

The fuel choke is an essential component in the fuel delivery system of Mercury, MerCruiser and Mariner engines. Its main function is to create pre-priming by controlling the build-up of petrol in the fuel line before starting, ensuring that the carburetor and injectors receive fuel immediately. This device works mechanically, allowing the operator to manually pump petrol into the engine without the engine needing to be running. Without a good primer, the engine may have significant starting difficulties, especially after periods of inactivity or maintenance, as the electric fuel pump may take time to completely fill the lines.

When to replace this part?

The petrol primer requires replacement when it shows signs of hardening, deformation, loss of elasticity or when it does not respond to manual pumping, allowing petrol to flow without building pressure or becoming difficult to operate. Although there is no strict interval of hours, it is recommended to check its visual and functional condition during each seasonal maintenance, especially at the beginning of the navigation campaign after prolonged periods of storage. Preventive replacement is economical compared to the repair costs that can arise from poor starting or the need to dismantle fuel circuit components in emergency conditions.

Compatible Mercury Mariner Engines

Equivalent manufacturer part numbers