8-20
2. Check the the genset starting battery voltage
when cranking and running the genset. Mea-
sure battery voltage between the brown lead
and ground (Figure 8-17). The pump will not
work properly if the cranking or running voltage
is less than 6 VDC.
If the battery voltage is low, charge the battery
and retest.
3. Remove the fuel line from the carburetor inlet
and install a pressure gauge.
4. Press the Start switch and hold it for several
seconds, until the pressure reading stabilizes.
5. The pressure reading should be 3.25 psi (22.4
kPa) to 4 psi (27.5 kPa). The pressure should
hold constant or drop off very slowly.
If the pressure reading is below 3.25 psi (22.4 kPa),
tap the pump body with a screw driver handle to free
the piston from fuel deposits. If the pump still does
not work and the battery voltage is adequate, re-
place fuel pump with an Onan-supplied pump.
If the pressure is higher than 4 psi (27.5 kPa), fuel
can overcome the needle and float assembly and
cause flooding. A negative fuel supply line pressure
(more than minus 1.3 psi or three feet of lift) will pre-
vent the pump from delivering enough fuel. Mea-
sure the pressure at the pump inlet. Inlet pump
pressure must be between a minus 1.3 psi and a
positive 1.5 psi (minus 8.3 kPa and positive 10.3
kPa). If an abnormally high or low inlet pressure is
measured the fuel line installation is improper. Re-
fer to the
Fuel System
section of the Installation
Manual.
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