1995 Johnson/Evinrude Outboards 50 thru 70 3-cylinder Service Manual, Page 62Get 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 requirementPI 173273 for PI 173274 for PI 173275 for 5 16
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