Checking The Primer Pump - Yamaha F150B Service Manual

4. Install the pin e.
5. While holding the fuel pump body 1
assembly a in place, insert a flathead
screwdriver into the hole d of the
plunger c and rotate it 90° until the tab
e on the diaphragm is aligned with the
slot f in the fuel pump body 1 assembly
a.
c
a
e f
6. Remove the fuel pump body 1 assembly
a from the vise, and then push down on
the plunger several times to make sure
that it moves smoothly.
7. Assemble the fuel pump assembly.
c
c
c
d
e
90
a
c
d
d
b
a
Fuel pump screw f:
4 N·m (0.4 kgf·m, 3.0 ft·lb)
TIP:
Make sure to align the projections a, b, and
c.

Checking the primer pump

1. Connect the special service tool a to the
primer pump inlet hose.
2. Cover the fuel outlet a with a finger.
3. Apply the specified positive pressure to
check that the pressure is maintained for
at least 30 seconds. Replace the primer
pump if it does not maintain pressure.
a
a
Leakage tester a: 90890-06840
Specified positive pressure:
170.0 kPa (1.70 kgf/cm
Fuel pump
f
0
f
c
1
a b c
2
3
4
5
6
7
8
9
10
2
, 24.7 psi)
A
6-12