Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 140Get this manual
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FUEL PUMP
Specifications
FUEL SYSTEM
Fuel Pump Type Fuel Pump: Pressure Plunger Stroke Fuel Tank Capacity
Exlernal (PlungerDiaphragm) 3-6 psi 0.230.38 in(5.859.65