TP-6376 3/08 47Section 5 General Maintenance
5.7 Fuel/Water Separator
The fuel/water separator collects accumulated water
and traps fuel oil sediment. At the specified interval and
without the unit running, open the water drain valve at
the bottom of the water separator and allow water to flow
into a suitable container. See Figure 5-3. When
complete, close the water drain valve. Drain off only the
water as fuel oil will continue to flow from this point. At
the specified interval, replace the fuel/water separator
element. To replace the element, use one of the
following procedures.
Note: Open the water drain valve only when the unit is
not running or when the fuel/water separator
bypass kit is activated.
1. Tee-handle
2. Fuel/water separator outlet shutoff two-way valve
(valve shown in open position)
3. To engine fuel filter
4. Water drain valve
5. Fuel/water separator element
6. Fuel supply connection
7. To engine fuel filter
8. Fuel supply three-way valve
(valve shown with flow to the fuel/water separator)
1
2
GM34358-H
3
4
5
6
7
8
Figure 5-3 Fuel/Water Separator with Bypass Kit
Shown, Typical
If other fuel system components were removed and/or
replaced, air may have entered the fuel system. If this
happens, the engine may experience starting difficulty
and/or erratic operation, which requires bleeding of the
fuel system. See the engine operation manual for fuel
system bleeding information.
Fuel/Water Separator Element Replacement
with Units Equipped with Bypass Kit
The bypass kit allows fuel/water separator element
replacement while the unit is running. Be aware that the
fuel and engine temperatures are higher when the unit is
running.
Use the fuel/water separator bypass k it even when the
unit is not running as it provides easy fuel shutoff and
minimizes air intrusion in the fuel system.
Hot engine and exhaust system.
Can cause severe injury or death.
Do not work on the generator set until
it cools.
WARNING
1. Rotate the fuel supply three-way valve handle 180_
so that the marker points away from the fuel/water
separator.
2. Close the fuel/water separator outlet two-way
valve so that the handle is perpendicular to the
valve.
3. Open the water drain valve and allow water and
fuel oil to flow into a suitable container.
4. Loosen the T-handle on top of the fuel/water
separator and remove the lid.
5. Remove the element by pulling upward on the
molded handle with a turning motion.
6. Wipe off excess fuel oil from each component using
a clean, dry rag.
7. Inspect components for wear or damage. Replace
parts as necessary.
8. Close the water drain valve.
9. Install the new element and fill the unit with clean
fuel.
10. Replace the lid gasket and apply a coating of clean
fuel to the seal.
11. Install the lid and hand-tighten the T-handle.
12. Wipe up all spilled fuel with a rag.
13. Open the fuel/water separator outlet two-way valve
until the handle is parallel to the valve.
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