TP-6073 4/06 23Section 4 Fuel System
Section 4 Fuel System
4.1 Fuel Specifications
Use clean, good quality diesel fuel oil with a cetane
number of 45 or greater. Clean fuel prevents diesel fuel
injectors and pumps from clogging.
Fuel Recommendation
United States ISO 8217 DMA, BS 2869, Part 1 Class
A1 or Part 2 Class A2
United Kingdom BS 2869-1983, Part 2 Class A2
Germany DIN 51 601-1978
Note: Avoid storing fuel for more than one month. Take
special precautions to keep all dirt, water, and
other contaminants out of the fuel to prevent the
growth of microbes. Microbes form slime that
clogs the fuel filter and lines.
Note: Do not run the generator set out of fuel because
the fuel lines will draw in air and necessitate
bleeding the fuel system before restarting the
generator set.
4.2 Fuel Filter
The fuel filter removes impurities from the fuel. Fuel
quality determines the element’s useful life. Replace the
fuel filter element according to the service schedule in
the operation manual. Section 1 shows the location of
the fuel filter. There are two types of fuel filtering
systems—the spin-on fuel filter and the fuel filter
element. Use the applicable procedure below to replace
the fuel filter. See Figure 4-1 or Figure 4-2.
Fuel Filter Service Procedure:
Note: The procedures to disable and enable the
generator set apply to both spin-on filters and fuel
filter elements.
Disable the Generator Set:
1. Place the generator set start/stop switch in the
STOP position.
2. Disconnect the generator set engine starting
battery, negative (--) lead first.
3. Close the fuel supply valve.
Spin-on Fuel Filter:
1. Loosen the fuel filter by turning it counterclockwise.
Remove the fuel filter and use rags to clean up any
spilled fuel oil. Dispose of the fuel filter in an
approved manner.
2. Clean the contact surface of the fuel filter adapter.
3. Lightly lubricate the gasket surface of the new fuel
filter with fresh fuel oil. Thread the filter onto the
adapter until the gasket makes contact;
hand-tighten the filter an additional one-half turn.
Proceed to step 1, Enable the Generator Set.
1
TP606111
1. Fuel filter adapter
2. Fuel filter
2
Figure 4-1 Spin-On Fuel Oil Filter
Fuel Filter Element:
1. Remove the retaining ring, filter cup, O-ring, spring,
and fuel filter element. See Figure 4-2.
2. Replace the fuel filter element.
3. Reinstall the spring, O-ring, filter cup and retaining
ring. Proceed to step 1, Enable the Generator Set.
Enable the Generator Set:
1. Open the fuel supply valve.
2. Reconnect the generator set engine starting
battery, negative (--) lead last.
3. Bleed the fuel system. See Section 4.3.
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