Checking The Fuel Pump; Disassembling The Fuel Pump - Yamaha FT50C Service Manual

FUEL

Checking the fuel pump

1. Install the special service tool onto the
fuel pump as shown.
Vacuum/pressure pump gauge set:
90890-06756
2. Apply the specified pressure to each fuel
pump port.
3. If air flow is reversed, check the dia-
phragm for tears and the valves for
cracks. Replace if necessary.
CAUTION:
Do not over pressurize the fuel pump, oth-
erwise excessive pressure may cause air
leakage.
NOTE:
• Make sure that air does not escape from
the opposite side of the fuel pump.
4-5
Fuel system
• To eliminate any gaps between the fuel
pump valves and the fuel pump body 2, and
to ensure a better seal, make sure that the
inside of the fuel pump is moist with gaso-
line.
Fuel pump pressure a:
50 kPa (0.5 kgf/cm
Fuel pump negative pressure b:
30 kPa (0.3 kgf/cm

Disassembling the fuel pump

1. Disassemble the fuel pump as shown.
2. Push down on the plunger and the dia-
phragm, turn the fuel pump body 1 1
approximately 90° to a position where the
pin 2 can be removed easily, and then
remove the pin.
2
, 7.1 psi)
2
, 4.3 psi)
62Y5A11