Checking The Fuel Pumps - Yamaha F115A Wartungshandbuch

FUEL
4240
FUEL PUMP
a
b
a

CHECKING THE FUEL PUMPS

1. Check:
• Diaphragm
• Fuel pump valves
Damage → Replace.
2. Check:
• Fuel pump
Reverse air flow → Replace.
Checking steps
NOTE:
Do not overpressurize the fuel pump.
Excessive pressure may cause air to leak
out.
(1) Install the Mity vac onto the fuel pump
as shown.
Mity vac
YB-35956 / 90890-06756
(2) Apply the specified pressure with the
Mity vac.
Fuel pump pressure a
50 kPa (0.5 kg/cm
Fuel pump negative pressure b
30 kPa (0.3 kg/cm
NOTE:
• Make sure no air comes out of the oppo-
site side of the fuel pump.
• To eliminate any gaps between the fuel
pump valves and the fuel pump body, and
to ensure a better seal, make sure the
inside of the fuel pump is wet (i.e., with
gas).
4-31
E
4
2
, 7.1 psi)
2
, 4.3 psi)