1994 Johnson/Evinrude Outboards 40 thru 55 Service Manual, Page 92Get this manual
This chart determines the condition of the fuel pump portion and motor portion of the pumpInstall gearcase pressure tester to pulse hose fittingPump to 15 PSIPump holds pressure?
Slowly pump gearcase testerInspect for escaping air Does pump click several times with each stroke of tester?i
Hold pump in normal running positionCover fuel outlet; rapidly remove pressure hose from pulse fittingPump should not clickDid pump click?
DIA-I Wait secondsUncover fuel outletPump should clickDid pump click?
STOP HEREAir motor housing is cracked or leakingRepair leak or INSTALL MOTOR HOUSING KIT
Shaft seal is leakingREPLACE INTERMEDIATE HOUSING
Locate external leakREPLACE AIR MOTOR HOUSING OR INTERMEDIATE HOUSING