1971 Evinrude 40HP outboards Service Manual, Page 17Get this manual
Figure 3-3Fuel Pump and Filter
FUEL TANK Figure 3-2Leaf Valve Assembly LEAF VALVES The leaf valves time the injection of the fuel mixture into the crankcase by opening only when the pressure in the crankcase has dropped to predetermined point on the compression strokeSee Figure 3-2The fuel tank is non-pressurized, suction operated tankFuel is lifted from the tank to the carburetor by the fuel pumpPriming is achieved by squeezing
CONNECTOR HOUSING