1994 Johnson/Evinrude "ER" 2 thru 8 outboards Service Manual, Page 62Get this manual
Description of Fuel System 2,2.3,3.3
r;] 1The fuel system consists of fuel tank mounted on the L!J powerhead, fuel filter and shut-off valve assembly, and carburetorFuel flows, gravity-fed, from the fuel tank to the carburetor
r:;l 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