2001-2002 Yamaha 50HP F50Z/T50Z Ouboard 4-stroke engines service manual, Page 103Get this manual
I I.i) I FUELFuel system
NOTE: Make sure that air does not escape from the opposite side of the fuel pump To eliminate any gaps between the fuel pump valves and the fuel pump body 2, and to ensure better seal, make sure that the inside of the fuel pump is moist with gasolineFuel 50 Fuel 30 pump pressurekPa (0.5 kgfcm2, 7.1 psi) pump negative pressure (6): kPa (0.3 kgfcm2, 4.3 psi)
Checking the fuel pump
Install the special service tool onto the fuel pump as shown