1990 Johnson Evinrude "ES" 60 thru 70 Service Manual, P/N 507873, Page 63Get this manual
3Anti-Siphon Valvesafety standards require permanently installed fuel systems to have anti-siphon protectionThis protection can be afforded in two ways All fuel distribution lines must be secured above the highest fuel level when the boat is in its normal, unloaded, static floating position Each fuel pickup tube must have an anti-siphon valve installed Anti-siphon valves used must have pressure drop of no more than 2.5 in of mercury (Hg) at flow rate of 20 gallons per hourThe following OMC valves meet this requirement: PIN 173273 for 516 in 1.0hose PIN 173274 for 38 in 1.0hose PIN 173275 for in0.0copper Fuel Distribution Linesminimum inside diameter of 38 in(9,5 mm) is required for V6 and larger engines in(9,5 mm) is preferred for V4 and smaller engines, while minimum of 516 in (7 ,9 mm) is requiredDistribution lines must be USCG Type "A" reinforced neopreneVinyl hose must not be used in permanently installed fuel distribution system5Fuel Distribution Fittingsall fittings must have minimum inside diameter of in(6,4 mm), while 93 in(7mm) is preferred6 Fuel Filterfuel filters must have pressure drop of no more than 0.4 inof mercury (Hg) at flow rate of 20 gallons per hourThe filter should have minimum filtered area of 200 square inches (1290 cmOMC Fuel Filter Kit PIN 174176 meets these requirements 7Fuel System PrimingOMC Electric Fuel Primer Kit PIN 174651 is available for built-in fuel systems The kit mounts near the fuel supply and, when activated, fills the fuel distribution lines and engine fuel system for quicker startingOMC Manual Filter Primer Assembly PI 398540 is available for engines below 120 HP 2-6