2004 SR Johnson 2-stroke 40, 50HP Service Manual, Page 148Get this manual
FUEL SYSTEM FUEL SYSTEM TESTS STEP With hose removed from small nipple on top side of primer pump, operate primer pumpFuel should squirt from small nippleResults: If primer fails to pump fuel, inspect primer nipple for obstructionsClean fitting with Nipple Cleaning Tool, PIN 326623, and retest If primer fails to pump fuel, disconnect inlet hose from the larger nipple on the primer pumpIf fuel does not flow freely from hose, there may be problem with the carburetor inletRefer to Carburetor Cleaning and Inspection on p163If the primer pump has fuel available and is still not working, or the pump is leaking externally, replace the O-ringsRefer to PRIMER PUMP on p.157