Filter Replacement - PREVOST H3-41 Maintenance Manual

If a Fuel Pro 382 fuel processor is installed on
the vehicle, refer to paragraph 2.4 Davco Fuel
Pro 382 otherwise, perform the steps below:
1. Prime filter by
pump until resistance is felt indicating that the
system is full of fuel.
2. Start the engine and run it at an increased
idle speed for approximately 5 minutes to
remove any remaining air in the system.
Check the fuel system for leaks.
2.4 DAVCO FUEL PRO 382
The optional Fuel Pro 382 fuel processor is
installed between the fuel tank and the fuel
pump. This system serves as a water separator
as well as a fuel filter (Figure 7).
The filter fibers used in the Davco Fuel Pro 382
element may cause the fuel level to read
artificially high when the filter is first installed.
Over the first few days, the filter fibers eventually
become fully saturated and the fuel level will
drop to normal levels. Do not be concerned
about an abnormally high fuel level when a new
Davco element is installed.
Fuel level rises as dirt collects on the filter from
the bottom up. Restriction remains consistently
low because fuel always flows through clean,
new media.
MAINTENANCE
Replace Fuel Pro 382 filter element when the
fuel level in the see-thru filter cover reaches the
top of the filter element.
operating hand primer
FIGURE 7: DAVCO FUEL PRO 382 INSTALLATION
2.4.1 Priming fuel system
To prime the fuel system, turn the engine off and
then proceed as follows:
Close the shut-off valve on the "fuel in" side of
the Fuel Pro unit and then pump fuel into the
engine through the quick coupling. When
completed, open the shut-off valve and keep on
pumping fuel about ten seconds to fill the fuel
line located between the Fuel Pro unit and the
fuel tank.
2.4.2

Filter replacement

1. Stop engine;
2. Place a suitable container under the fuel
processor;
3. Close the shut-off valve on the "fuel in" side
of the fuel filter;
4. Open the drain valve at the base of the Fuel
Pro body and drain the fuel until it is below
the collar level;
5. Untighten the collar, remove clear cover, filter
spring, filter element and cover seal;
6. Dispose of used filter element, cover seal and
vent cap seal;
7. Using a clean shop rag, clean the cover, the
collar and threads on the Fuel Pro body.
8. Ensure the filter grommet is included in the
base of the new filter element and then install
the element onto the center stud;
PA1621 Maintenance Manual All Series | Revised May 2018
SECTION 03 : FUEL SYSTEM
9