three additional ribs, depending on the specific
filter model.
11. Prime the system.
11.1 Ensure that the drain valve is closed.
11.2 Fill the housing to the top of the filter ele-
ment with clean diesel fuel.
11.3 Install and hand-tighten the vent cap
O-ring and vent cap.
11.4 Start the engine. When the lubricating oil
reaches its normal operating pressure,
increase engine speed to high idle for
one to two minutes to purge air from the
system.
11.5 While the engine is running, and after the
air is purged from the system, loosen the
vent cap until the fuel level falls to about
one inch (2.5 cm) above the collar, then
hand-tighten the vent cap.
11.6 Check for leaks and shut down the
engine.
Detroit
The only maintenance necessary on an Detroit
fuel/water separator is to replace the filter element.
See
Fig. 5.
WARNING
Fluid circulated through the fuel/water separator
to heat the fuel may be diesel fuel returned from
the engine, or engine coolant. Drain the fuel/water
separator only when the engine and fluids have
cooled. Draining it when the engine is hot could
cause severe personal injury due to scalding.
12/13/2010
f470531a
3
4
5
6
7
8
9
10
11
13
14
1
2
12
1. Drain Valve
2. Bottom Plate
Assembly
3. Bottom Plate O-Ring
4. Lower Housing
5. Cover O-Ring
6. Filter Element
7. Spring
8. Clear Cover
9. Vent Cap O-Ring
10. Vent Cap
11. Collar
12. Grommet
13. Inlet Port/Check Valve
14. Heat Exchanger
Fig. 2, DAVCO Fuel Pro 382
02/16/2009
f470277
VENT CAP
FOR REMOVAL OF TOP COLLAR ONLY
Fig. 3, DAVCO Collar Wrench
Fuel 47
Recreational Vehicle Chassis Maintenance Manual, April 2018 47/3
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