Mercury Mariner 4, 5 102CC Sail 1990 Outboard Service Shop Manual, Page 167Get this manual
5Loosen sc re (a) and pull fuel cock (b) from integ ral fuel tank 7Inslall fuel hoses to lee fitting (a) fuel filter (b) and fuel cock (cl as shownSecure hoses with lips (d) Make sure lip oes not interfere with fuel coc level
8Reinstall integral fuel tankRefer to Sectio 3A in Ihe Serv ice Manual6Connect fuel cock (a) onto fitting of integral fuel ta nkTighten screw (b) securely Make su re rubber sea (c) is seated around the fuel tank fitting 9Remove screw (a) and pull fuel cock kn ob rod (b) from bottom cowl