1973 Evinrude Norseman 40 HP Service Manual, Page 25Get this manual
1- - UPPER HOUSING AND FUEL LINE ASSEMBLY -SCREEN
Figure 3-23Fuel Tank Upper Housing year, and at every tune-up or maj or repair To facilitate complete draining of the tank, drain screw is provided in the fuel tank upper housingSee Figure 3-23Clean the tank by flushing with clear gasoline or solventSee Owner's Manual for correct fuel mixtureDESCRIPTION The fuel tank is of simple but rugged construction' with capacity of gallons of fuel mixtureIt includes the bulb primer (for priming the fuel pump), fuel level gage, fuel hose and connectors, bracket arrangement to hold the fuel line when not in use, and carrying gripThe fuel tank upper housing, which provides the connection to the fuel hose, contains two release valves and disc valve which prevent any escape of gasoline or fumes, minimizing the danger of explosion or fireFigure 3-24Fuel Tank Level Indicator