Removing The Fuel Pump; Checking The Fuel Pump; Disassembling The Fuel Pump - Yamaha F4B Service Manual

Removing the fuel pump

1. Remove the fuel pump a and O-ring b.
a

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.
b
b
a
0
Vacuum/pressure pump gauge set a:
90890-06756
Specified positive pressure:
50.0 kPa (0.50 kgf/cm
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.
b
a
50
2
, 7.3 psi)
a
b
b
0
Specified positive pressure:
50.0 kPa (0.50 kgf/cm

Disassembling the fuel pump

1. Remove the cover a, diaphragm b, and
fuel pump body 2 c.
a
b
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.
e
a
3. Remove the pin f by pushing the
plunger and diaphragm.
Fuel pump
a
50
2
, 7.3 psi)
c
b
d
10
6-22
0
1
2
3
4
5
6
7
8
9
A