Checking The Fuel Pump - Yamaha EK25BMH Service Manual

FUEL
FUEL PUMP

CHECKING THE FUEL PUMP

1. Check:
1
• Body
2
• Body
3
• Body
4
• Body
Cracks/damage/leak → Replace.
Foreign matters → Clean.
• Seat valve
Cracks/ damage → Replace.
• Diaphragm
Damage → Replace.
2. Check:
• Fuel pump
Reverse air flow → Replace.
Checking steps
NOTE:
Do not overpressurize the fuel pump. Exces-
sive pressure may cause air to leak out.
(1) Install the Vacuum/pressure pump gauge
set onto the fuel pump as shown.
Vacuum/pressure pump gauge set
90890-06756
(2) Apply the specified pressure with the
Vacuam/pressure pump gauge set.
Fuel pump pressure
50 kPa (0.5 kg/cm
NOTE:
• Make sure no air comes out of the
opposite side of the fuel pump.
• Start the engine and confirm the proper
function.
4-6
5
6
2
, 7.25 psi)
E