2002/2003 Johnson SN/ST 2 Stroke 3.5, 6 8 HP Outboards Service Manual, PN 5005466, Page 115Get this manual
FUEL SYSTEM FUEL TANK3.5
68 MODELS
The fuel system consists, of the following components: Portable fuel tank Fuel pump Carburetor Intake manifold The fuel pump is diaphragm-displacement type and is operated by changes in crankcase pressureAlternately, vacuum and pressure in the crankcase are transmitted to the pump diaphragm
FUEL TANK3.5
A fuel tank is mounted on the powerhead Fuel flows, gravity-fed, from the fuel tank to the carburetorDrain and flush the fuel tank at least once year and at every tune-up or major repairDrain tank at an outdoor location, away from all possible sources of ignition