1999 "EE" Evinrude 70HP 4-Stroke Service Manual, P/N 787023, Page 43Get this manual
Boat Fuel Line The boat fuel supply line must be minimum of 5 16 in(8 mm) inside diameter, and should meet all A.S.Y.Cstandards for such installationsFuel Filters The fuel system is protected by three filters that prevent water and debris clogging vital parts of the fuel system [JJ
The low pressure filter is nylon canister located at the port front of the powerhead below the intake manifoldIt filters incoming fuel before it reaches the mechanical fuel pumpNote the "OUT" arrow near the top fitting small screen is located over the high pressure pump's fuel intake portClean or replace the screen whenever the vapor separator is apart for serviceThe high pressure filter is metal canister located at the middle of the port side of the powerhead, just below the intake manifoldIt filters fuel from the high pressure pump before it reaches the fuel railNote that the filter body is embossed "IN" and "OUT"; make sure hose attachments are correctFuel Pumps Two fuel pumps work together to supply the injectors; low pressure pump and high pressure pump