Mercury Outboard Fuel Pump Diaphragm 55156A5 80hp 115hp 150hp 40hp 1970s 55278A1 Valve Covers but won't affect function (picture

but won't affect function (picture 3)

and you will need to track down OMC P/N 0985749 and the pin 0913663 / 913663

Used in most but not all OMC 3

Lark Seahorse

Mercury Outboard Fuel Pump Diaphragm 55156A5 80hp 115hp 150hp 40hp 1970s 55278A1 Valve Covers but won't affect function (pictureItem Description Mercury Part Number 55156A5 Fuel Pump Assembly Also part of this assembly is the diaphragm kit 55278A1 Found on various Mercury 4 cylinder & 3 cylinder outboards with dual fuel pumps that look like this, newer models (serial group #2) had a competely different style of pump. Please ask or consult your parts manual for ultimate compatibility. If you are unsure on compatibility feel free to ask! Purchase with confidence! General