Disassembling The Fuel Pump Assembly; Checking The Diaphragm And Valve; Assembling The Fuel Pump Assembly - Yamaha F150A Service Manual

Specified positive pressure:
50.0 kPa (0.50 kgf/cm
Disassembling the fuel pump
assembly
1. Remove the cover "1", diaphragm "2",
and fuel pump body 2 "3".
3
2. Hold fuel pump body 1 "1".
1
2
Small end bearing installer "2":
90890-06528
3. While holding fuel pump body 1 "1" in
place, insert a flathead screwdriver into
the hole "a" in the plunger "2" and turn it
90°.
90
a
1
4. Remove the pin "1".
2
, 7.3 psi)
2
1
2
1
2
1
5. Remove the diaphragm "1", plunger "2",
and springs "3" and "4".
2

Checking the diaphragm and valve

1. Check the diaphragm "1". Replace if torn.
2. Check the valve "2". Replace fuel pump
body 2 "3" if deformed or worn.
1

Assembling the fuel pump assembly

Before assembling the fuel pump assembly,
a
clean the parts and soak the valves and dia-
phragm in gasoline to obtain prompt opera-
tion of the fuel pump assembly.
2
1. Install the springs "1" and "2", plunger
"3", and diaphragm "4".
6-14
1
3
3
Fuel pump
0
1
2
3
1
4
4
5
6
7
8
2
9
10
A