TP-5594 5/953-6 Scheduled Maintenance
Fuel System
Specification
Use a clean, good quality No. 2-D (DIN 51 601) diesel
fuel oil. The fuel must meet the requirements of the
American Society of Testing and Materials (ASTM)
diesel fuel classification D975 (Federal Specification
W-F-800a). Cleanliness of the fuel is especially
important on diesel engines which have easily clogged,
precision fuel injectors and pumps. See chart below.
United States ASTM/D975 No. 2-D Diesel
United Kingdom BS2869 Class A1
Other Considerations:
Sulfur Content Less than 0.5%. . .. . .. . .. . .. . .. . ..
Sediment/Water Content Not to exceed 0.05%. . .. . .
Cetane Number 45 minimum. . .. . .. . .. . .. . .. . .. . .
Flash point At least 125_F (52_C). . .. . .. . .. . .. . ..
NOTE
Never store diesel fuel in galvanized containers; diesel
fuel and the galvanized coating react chemically to
produce flaking which quickly clogs filters or causes
failure of the fuel pump or injectors. Do not run the
generator set out of fuel; air will be drawn into the fuel
lines and the entire system will have to be bled before
the unit can be restarted.
NOTE
Avoidstoringfueloverlongperiodsoftime. Takespecial
precautions to keep all dirt, water, and other
contaminants out of the fuel. Storage tanks containing
diesel fuel contaminated with water may cause the
growthofmicrobes. The presence of microbes willform
a slime which clogs fuel filters and lines.
Fuel Filter
(Metal Spin-On Type)
The fuel filter servesto remove water anddirtcontained
in the fuel. Do not attempt to clean paper fuel filter
element. Its useful life will be determined largely by the
quality and condition of the fuel used. Under normal
conditions,replacethefuelfilterelementforthefirsttime
after50hoursoronemonthandthenevery400hoursor
six months. See Figure 3-6 for location and use the
following procedure to service the fuel filter.
1. Loosen the fuel filter by turning in a
counterclockwise direction. Use rags to clean up
spilled fuel oil. Remove and discard filter.
2. Clean contact surface on the fuel filter adapter.
3. Lightly lubricate the gasket surface of the new fuel
filter with fresh fuel oil. Thread the fuel filter onto
the adapter until the gasket makes contact, hand
tighten an additional one-half turn.
4. See Bleeding section following.
1-932
1
1. Fuel Filter
Figure 3-6. Fuel Filter Location
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