1990 Johnson Evinrude "ES" Cross V 88 thru 115, 150 thru 175, P/N 507874, Page 59Get this manual
3Anti-Siphon Valvesafety standards require permanently installed fuel systems to have anti-siphon protection This 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 installedAnti-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 PIN 173274 for PIN 173275 for 516 3 3
in1.0hose in1.0hose in0.0copper
4Fuel Distribution Lines -a minimum inside diameter of 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 V4 in(6,4 mm), while 93 in(7,1 mm) is preferred6Fuel Filterfuel filters must have pressure drop of no more than 0.4 in of mercury (Hg) at flow rate of 20 gallons per hourThe filter should have minimum filtered area of 200 square inches (1290 cm )