1975 Evinrude 40 HP Outboards Service Manual, PN 5093, Page 28Get this manual
Figure 3-23Fuel Tank Upper Housing year, and at every tune-up or major repairTo facilitate complete draining of the tank, drain screw is provided in the fuel tank upper housing See 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 mixtur eIt includes the bulb primer (for priming the fuel pump), fuel level gage, fuel hose and connectorsbracket 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 dis valve which prevent any escape of gasoline or fumesminimizing the danger of explosion or fire Figure 3-24Fuel Tank Level Indicator