TP-6068 10/0214 Section 3 Scheduled Maintenance
3.5 Fuel System
3.5.1 Fuel Specifications
Use a clean, good quality diesel fuel oil with a cetane
number of 45 or greater. Clean fuel prevents the diesel
fuel injectors and pumps from clogging.
Fuel Recommendations
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: Never store diesel fuel in galvanized containers;
diesel fuel and the galvanized coating react
chemically to produce flaking that quickly clogs
filters or causes fuel pump or injector failure.
Note: Avoid storing fuel for more than one month. Take
special precautions to keep all dirt, water, and
other contaminants out of 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
unit.
3.5.2 Fuel Filter
The quality and condition of the fuel largely determine
the filter’s useful life. Replace the fuel filter element as
listed in the service schedule. Section 1 shows the
typical location of a fuel filter. Use the applicable
procedure below to replace the fuel filter.
Fuel Filter Cleaning/Replacement Procedure
4/6.5EFOZ and 5/8EOZ Models:
1. Close the fuel supply valve.
2. Remove the collar from the fuel filter adapter while
holding the filter bowl in place.
3. Remove the filter bowl and fuel filter. Clean the fuel
filter with fresh fuel oil and blow compressed air
from the inside outward. Replace a damaged fuel
filter. Dispose of the fuel filter in an approved
manner.
4. Wipe off all parts with a clean rag. Inspect all
mating surfaces and threads for damage; replace
as necessary.
5. Place the fuel filter into the filter bowl and lubricate
the rubber seal with fresh fuel oil. Wash hands after
any contact with fuel oil.
6. With the collar against the filter bowl flange,
position the fuel filter against the adapter and
hand-tighten the collar.
7. Open the fuel supply valve.
8. Bleed the system. See Section 3.5.3, Bleeding the
Fuel System.
8.5--27EFOZ and 10--32EOZ Models:
1. Close the fuel supply valve.
2. Loosen the fuel filter by turning it counterclockwise.
Remove the fuel filter and use rags to clean up
spilled fuel oil. Dispose of the fuel filter in an
approved manner.
3. Clean the c ontact surface of the fuel oil filter
adapter.
4. Lightly lubricate the gasket surface of the new fuel
filter with fresh fuel oil. Thread the filter on the
adapter until the gasket makes contact;
hand-tighten the filter an additional one-half turn.
Wash hands after any contact with fuel oil.
5. Open the fuel supply valve.
6. Bleed the system. See Section 3.5.3, Bleeding the
Fuel System.
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