Yamaha F4B Service Manual

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

Yamaha F4B Specifications

General

Brand	Yamaha
Model	F4B
Category	Outboard Motor
Language	English