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.
DAVCO Fuel Pro® 487
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.
If returning fuel is released into the atmosphere,
its vapors can ignite in the presence of any igni-
tion source. Do not expose the fuel to, or work
with the fuel system near, open flame or intense
heat. To do so could cause fire, possibly resulting
in serious personal injury or property damage.
1. Shut down the engine, apply the parking brake,
and chock the tires.
2. Check the fuel level in the fuel filter. Replace the
fuel/water separator element only when the filter
element is completely covered. If the fuel level
has reached the top of the filter element, follow
the procedure below to replace the element.
3. Put a clean receptacle under the fuel/water sepa-
rator and attach a piece of hose to the drain
valve, to direct fuel into the receptacle.
On older models, the drain valve has a 1/2-inch
(12.7-mm) pipe with threads. Use a hose with a
1/2-inch pipe thread to fit correctly and open the
drain valve by turning it one-quarter revolution.
On new models, the drain valve has a 3/4-inch
(19-mm) slip-on hose connection; pipe threads
are no longer used. Open the drain valve by
turning it one to one-and-a-half revolutions.
4. Remove the vent cap, shown in
Fig. 5, to drain
the fuel completely, then close the drain valve.
05/05/2009 f470530
1
2
3
4
5
6
7
8
9
10
11
12
13
1. Inlet Port/Check Valve
2. Lower Housing
3. Bypass Valve
4. Filter Element
5. Spring
6. Clear Cover O-Ring
7. Clear Cover
8. Vent Cap O-Ring
9. Vent Cap
10. Lower Housing Collar
11. 120VAC Pre-Heater
12. 12VDC Pre-Heater
13. Drain Valve
Fig. 4, DAVCO Fuel Pro 482
Fuel47
108SD and 114SD Maintenance Manual, May 201847/4
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