Yamaha F4B - Checking the Fuel Pump; Disassembling the Fuel Pump; Removing the Fuel Pump

6-22
Fuel pump
0
1
2
3
4
5
6
7
8
9
10
A
Removing the fuel pump
1. Remove the fuel pump a and O-ring b.
Checking the fuel pump
1. Connect the special service tool a to the
fuel pump inlet a.
2. Block the fuel pump outlet b using the
rubber plug b, and then apply the
specified positive pressure. Check that
there is no air leakage.
3. Connect the special service tool a to the
fuel pump outlet b.
4. Block the fuel pump inlet a using the
rubber plug b, and then apply the
specified positive pressure. Check that
there is no air leakage.
Disassembling the fuel pump
1. Remove the cover a, diaphragm b, and
fuel pump body 2 c.
2. Align the slot a in the fuel pump body 1
d with the hole b in the plunger e by
turning the plunger e.
3. Remove the pin f by pushing the
plunger and diaphragm.
Vacuum/pressure pump gauge set a:
90890-06756
Specified positive pressure:
50.0 kPa (0.50 kgf/cm
2
, 7.3 psi)
b
a
500
a
b
b
a
Specified positive pressure:
50.0 kPa (0.50 kgf/cm
2
, 7.3 psi)
500
a
b
a
b
c
b
a
a
b
e
d