1998 Johnson Evinrude "EC" 150, 175 FFI Service Manual, P/N 520211, Page 35Get this manual
Fuel System Components Anti-Siphon Valve
If an anti-siphon valve is used, it must be of sufficient size and rating as to allow maximum fuel flow at all timesBronze anti-siphon valves that resist corrosion are highly recommended, aluminum ones are notOMC offers the correct valves; contact your OMC Genuine Parts dealerBoat Fuel Line
The boat fuel supply line must be minimum of 38 in(9,5 mm) inside diameter, and should meet all A.B.Y.Cstandards for such installationsFuel Filter
The FFI fuel system is protected by fi Iter that prevents water and debris clogging vital parts of the fuel system
A canister water separator filter is located at the port rear of the powerheadIt has 13 micron rating, and should be replaced on yearly basisHose attachment is important; the outlet (center) nipple is identified by the word "OUT" cast in the top of the filter bracketDo not substitute filter of lesser capabilityWater-in-Fuel Sensor