Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 372Get this manual
Oil Pump Inlet Check Valve Leak Test 1Disconnect both fuel lines (a) from AutoBlendSeal off outlet fitting (b)
IMPORTANT: DO NOT apply more than PSI of ail pressure3Apply up to PSI to fuel filter inlet fitting Check valves should not allow drop in meter reading Check rubber valves for cracks, holes or before replacing both inlet and outlet check if leak occursRefer to disassembly procedures fol lowing