1999 "EE" 90, 115 FFI, 150, 175 V4, V6 FFI Outboards Service Manual, P/N 787024, Page 115Get this manual
Boat Fuel System Recommendations Purpose
This information is provided to assist you in evaluating boat's permanently installed fuel system Outboards require boat fuel system that is capable of high fuel flow rate with low pressure drop across the entire systemIt is very important that all boat fuel system components have the correct capacity and are properly installedABYC's Standard H-24 and ICOMIA's Standard No.17 are accepted as industry standards and should be referred to for additional informationRecommendations
1Fuel Tank Pickup Tubeminimum inside diameter of 38 in (9,5 mm) is required for V6 and larger outboardsA minimum of 516 in(7,9 mm) is required for V4 and smaller outboards, but 3 in (9,5 mm) inside diameter is preferredDual 70 3-cylinder and larger outboards each require separate fuel pickup tube