Onan MicroLite 4000 Series User Manual

8-19
Fuel Filter
Change the fuel filter at the interval recommended
in the Operator’s Manual, or if performance prob-
lems occur and bad fuel is suspected.
WARNING
Fuel presents the hazard of fire or
explosion that can cause severe personal injury
or death. Do not permit any flame, spark, pilot
light, cigarette, arc-producing equipment, elec-
trical switch, or other ignition source near the
fuel system. Keep a type ABC fire extinguisher
nearby.
1. Close the fuel supply valve (if equipped) or re-
move the fuel line from the fuel filter. Plug the
end of the fuel line to prevent fuel leakage and
vapor accumulation. See Figure 8-16.
2. Run the genset until it runs out of fuel. Allow the
genset to cool down before replacing the fuel
filter.
3. Use a deep 11/16-inch socket to unscrew the
filter from the fuel pump.
4. Install a new fuel filter and tighten it securely to
prevent fuel leakage.
5. Connect the fuel line to the new filter. Open the
fuel valve (If equipped). Start the genset and
check for fuel leaks. Repair any leaks immedi-
ately.
CAUTION
Incorrect replacement of service
parts can result in damage to equipment. Use
genuine Onan replacement fuel filter only.
Fuel Pump
An electric fuel pump is used to supply fuel to the
carburetor. If the pump malfunctions or if insufficient
fuel delivery is suspected, use the following proce-
dures to test the fuel pump.
WARNING
Do not substitute an automotive
electric fuel pump for the Onan-supplied fuel
pump. The output pressure from an automotive
pump is much higher and can cause carburetor
flooding or fuel leakage, creating a fire hazard.
WARNING
Fuel presents the hazard of fire or
explosion that can cause severe personal injury
or death. Do not permit any flame, spark, pilot
light, cigarette, arc-producing equipment, elec-
trical switch, or other ignition source near the
fuel system. Keep a type ABC fire extinguisher
nearby.
Fuel Pump Test:
Test the fuel pump by checking
the fuel pump outlet pressure as follows:
1. Make sure the fuel tank has sufficient fuel to
supply the genset. The genset fuel pick-up tube
ends well above the bottom of the vehicle fuel
tank. The genset can be out of fuel even when
the tank is partly full.
FS1868-1s
FUEL FILTER
FUEL PUMP
FIGURE 8-16. FUEL FILTER REPLACEMENT

Onan MicroLite 4000 Series Specifications

General

Brand	Onan
Model	MicroLite 4000 Series
Category	Portable Generator
Language	English