Checking The Fuel Pump And Pressure Regulator Operation - Yamaha YXR70FX Service Manual

1
2 2
3
THROTTLE BODY
EAS00915
CHECKING THE FUEL PUMP AND
PRESSURE REGULATOR OPERATION
1. Check:
• pressure regulator operation
M MMM M MMM M M MMM M
a. Remove the seat.
Refer to "SEATS, REAR CONSOLE AND
INSTRUMENT PANELS" in chapter 8.
b. Disconnect the fuel hose 1 from the fuel
pump.
TIP:
Before removing the hose, place a few rags in
the area under where it will be removed.
c. Connect the pressure gauge 2 and adapter
3 to the fuel pump and fuel hose.
Pressure gauge
90890-03153, YU-03153
Fuel pressure adapter
90890-03176, YM-03176
d. Start the engine.
e. Measure the fuel pressure.
Fuel pressure
324 kPa (3.24 kg/cm
Out of specification → Replace the fuel
pump.
L LLL L LLL L L LLL L
6 - 43
FI
M MMM M M MMM M M MMM M MMM
2
, 46.1 psi)
L LLL L L LLL L L LLL L LLL