General, Testing the fuel pump – Generac 86640 User Manual
Page 62
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Section 5.2- FUEL PUMP
General
The fuel pump Is energized ON during cranking and
running when an engine controller circuit board delivers 12
volts DC power to a Wire No. 14 circuit. Circuit board action
also energizes (a) a fuel solenoid, (b) a choke heater, and (c)
the engine ignition system.
Testing the Fuel Pump
Use an ohmmeter or a volt-ohm-mllliammeter (VOM) to
test the pump windings for continuity.
To perform an operational test of the pump, disconnect
fuel line from the punp outlet side and connect pump inlet
side to a fuel supply. Connect a +12 volts DC power supply
(such as a battery) to the pump WHITE wire and a -12volts
DC power to the pump’s BLACK wire. The pump should
operate and pump fuel. Replace pump. If defective.
Figure 2. Eiectric Fuel Pump
Page 5.2-1