Checking The Fuel Pump; Fuel Return Hose - Yamaha YZF-R1P Service Manual

FUEL PUMP SYSTEM
EAS00819

CHECKING THE FUEL PUMP

WARNING
_
Gasoline is extremely flammable and under
certain circumstances there can be a dan-
ger of an explosion or fire. Be extremely
careful and note the following points:
• Stop the engine before refueling.
• Do not smoke, and keep away from open
flames, sparks, or any other source of
fire.
• If you do accidentally spill gasoline, wipe
it up immediately with dry rags.
• If gasoline touches the engine when it is
hot, a fire may occur. Therefore, make
sure the engine is completely cool before
performing the following test.
1. Check:
• Fuel pump operation
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a. Insert the plug 1 to fuel return hose end.
b. Fill the fuel tank.
c. Put the end of the fuel hose into an open
container.
d. Connect the battery (DC 12 V) to the fuel
pump coupler as shown.
Positive battery lead → red/blue 2
Negative battery lead → black 3
e. If fuel flows out of the fuel hose, the fuel
pump is OK. If fuel does not flow, replace
the fuel pump.
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ELEC
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