1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 20Get this manual
MAINTENANCE
Fuel System
WARNING
Avoid serious injury or death from gasoline fire or explosionCarefully follow all fuel system service instructionsAlways stop the engine and DO NOT smoke or allow open flames or sparks in the area while servicing any part of the fuel systemBefore servicing any part of the fuel system, stop engine and disconnect the batteryDrain the fuel system completelyUse an approved container to collect and store fuelWipe up any spillage immediatelyMaterial used to contain spillage must be disposed of in an approved receptacleAny fuel system service must be performed in well ventilated areaInspect any completed service work for sign of fuel leakage
Fuel Line Inspection
Visually inspect the fuel line and primer bulb for cracks, swelling, leaks, hardness or other signs of deterioration or damageIf any of these conditions are found, the fuel line or primer bulb must be replaced