Yamaha F40B - Checking the Fuel Joint; Disassembling the Fuel Pump; Checking the Diaphragm and Valve

FUEL
Fuel system
4-5 67C3K11
Checking the fuel joint
1. Check the fuel joint. Replace if cracked
or damaged.
2. Connect the special service tool to the
fuel joint outlet.
3. Apply the specified positive pressure.
Replace the fuel joint if the specified
pressure cannot be maintained for at
least 10 seconds.
Disassembling the fuel pump
1. Disassemble the fuel pump as shown.
2. Remove the pin 1 from the plunger 2,
and then disassemble fuel pump body 1
3.
NOTE:
• Push the plunger 2 and the diaphragm
completely inward, and then turn fuel pump
body 1 3 approximately 90° to a position
where the pin 1 can be removed easily.
• Slowly release on the plunger 2 and dia-
phragm, and then remove them.
Checking the diaphragm and valve
1. Check the diaphragms 1 and valves 2.
Replace the diaphragms if torn or replace
the fuel pump body 2 assembly if the
valves are cracked.
Vacuum/pressure pump gauge set:
90890-06756
Specified positive pressure:
50 kPa (0.5 kgf/cm
2
, 7.3 psi)
S6AU4004
S67C4009
S67C4010
90˚
2
3
S67C4011
1
S67C4012
2
1
1
2