Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 345Get this manual
No Fuel Flow From AutoBlend Test or Check Results Corrective Action
1Check fuel connectionsMake sure both
hoses are connected to the proper AutoBlend fittings
Fuel lines properly connectedFuel lines improperly connected Filter pluggedFilter OKAutoBlend operates correctlyAutoBlend does not operate correctlyDiaphragm moves in or out with one audible click in either directionDiaphragm does not move
Check fuel filterConnect fuel lines properlyReplace fuel filterUse back flush procedureTesting done, problem solved Check diaphragm actionAutoBlend OK
2Fuel filter inspection Look for plugged filter
3Back flush procedureRefer to AutoBlend instruction manual Quicksilver
(90-13604) 4Check diaphragm action Remove oil
mixing valve coverPushpull diaphragm gently