Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 64Get this manual
Fuel Pump Disassembly and Reassembly FUEL PUMP INSTALLED
FUEL PUMP COMPONENTS IMPORTANT: Align all gasket and diaphragm aligning tabs with fuel pump aligning tabs during reassemblyNOTE: In fuel pump reassembly, remember that respective diaphragms go against the mating surfaces of the fuel pump body, and respective gaskets are between the diaphragms and end capsGaskets should always be replaced on fuel pump reassembly