1997 Johnson Evinrude "EU" 125C, 130, 200, 225, 250 90 LV Service Manual, P/N 507269, Page 82Get 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 installedAnti-siphon valves used must have pressure drop of no more than 2.5 inches 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
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4Fuel Distribution Linesminimum inside diameter of 38 in(9,5 mm) is required for V6 and larger engines38 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 "A1" or "81"Vinyl hose must not be used in permanently installed fuel distribution system5Fuel Distribution Fittingsall fittings must have an inside diameter of: