Honda BF115A, BF130A Outboard Motors Shop Manual., Page 425Get this manual
FUEL PIPE JOINT INSTALLATION Coat the engine oil to the new O-rings and install them to the fuel pipe joint, then install the fuel hose to the fuel pipe with the 25 flange bolt[I] FUEL PIPE
NOTE: To prevent the fuel leaks, make sure the fuel pipe joint and fuel hose fixed the fuel pipe securely before tightening the 25 flange bolt