Mercury Outboard Fuel Pump Diaphragm 55156A5 80hp 115hp 150hp 40hp 1970s 55278A1 Pulley - Crankshaft This one measures just over

This one measures just over 4" See photos comparing ours to an original

These are very similar to other timing 4

1500XS 4868648 THRU 5327662 (MERCURY)

Upper and Lower Mount Washer: 908115

Please Check your outboards parts diagram to ensure compatibility

Mercury Outboard Fuel Pump Diaphragm 55156A5 80hp 115hp 150hp 40hp 1970s 55278A1 Pulley - Crankshaft This one measures just overItem 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