Secondary Fuel Filter Replacement; Priming The Fuel System; Priming Fuel System - PREVOST H3-41 Maintenance Manual

SECTION 03 : FUEL SYSTEM
Difference between secondary fuel filter end
PRE-GHG17 END CAP
DESIGN
2.2.2

Secondary Fuel Filter Replacement

1. Stop engine, close the fuel supply line shut-
off valve. Place an appropriate container
under the fuel filter housing.
2. Clean around sealing area on fuel filter and
housing.
3. Unscrew and remove the
secondary fuel filter from
the fuel filter housing.
4. On the new filter, apply clean engine oil to
the inner & outer seals. Do not install
pre-GHG17 fuel filters on GHG17 engines.
FIGURE 5: SECONDARY FUEL FILTER
5. Screw the new dry fuel filter in place. Rotate
clockwise until the seal contacts the base.
Then rotate clockwise another 1/2 - 3/4 turn.
8
PA1621 Maintenance Manual All Series | Revised May 2018
caps
GHG17 END CAP DESIGN
WITH DEEP GROOVE
CAUTION
Fuel in the old filter must absolutely not be
poured into the new filter. This kind of
contaminated fuel can damage the unit
injectors.
6. Prime the fuel system by pumping the hand
priming pump on the fuel filter housing until
resistance is felt indicating that the system is
full of fuel.
7. Start the engine
fuel-tightness check. Let the engine run for
about 5 minutes to remove air pockets from
the fuel system.

2.3 PRIMING THE FUEL SYSTEM

The fuel system will need to be bled if:
 The vehicle has run out of fuel.
 The engine has not been running for an
extended period of time.
 Service work has been done on the fuel
system, (tank, fuel lines, filters, valves, etc.)
for example cleaning or replacing fuel filter
cartridges.
 The engine is new or rebuilt.
FIGURE 6: HAND PRIMING PUMP
NOTE
When the fuel system is empty, 200 or more
pump strokes may be needed to properly
prime system. There are no bleed nipples to
be opened to prime the fuel system.
and carry out a