1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 110Get this manual
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FUEL PUMP
Specifications
FUEL SYSTEM Fuel Pump Type Fuel Pump: Pressure Plunger Stroke Fuel Tank Capacity External (PlungerDiaphragm) 3-6 psi (21-41 kPa) 0.140.27 in(3.526.58 mm) 3.