1991 Johnson/Evinrude EI Outboards 2.3 thru 8 Service Manual, Page 62Get this manual
Description of System 2.3,3.3
f1l 1The fuel system consists of fuel tank mounted on the powerhead, fuel filter in shut-off valve and carburetorFuel flows, gravity-fed from the tank to the carburetor3 Thru 8
1The fuel pump is of the diaphragm-displacement type, and is operated by changes in crankcase pressureAlternately, suction and pressure in the crankcase are transmitted to the pump diaphragm!al 2The carburetor meters and distributes the fuel consumedIt controls engine speed and power output by varying the intake charge densityTo react correctly to wide range of operating conditions, the carburetor has multiple fuel mixing circuits3Mixture enrichment for cold starting is controlled by choke