Page 464
REPAIR INSTRUCTIONS, PART 3
Fuel System
GENERAL INSTRUCTIONS
1. Check the fuel system to ensure that all
connections are tight.
2. Remove any trapped air by operating the
manual priming pump located on the side of
the fuel supply pump, using the following
procedure.
Prime the fuel system with clean, Grade 2D
diesel fuel (DF-A).
PRIMING THE FUEL SYSTEM
Using a hand-priming pump is usually only
necessary when the fuel system has run dry. If
the hand-priming pump is needed, use the
following procedure for priming a dry fuel system.
1. Install a hand-priming pump at the fuel tank.
2. Fill the pre-pump and primary filters (if
equipped) or the primary and secondary fuel
filters (if equipped) if not already done.
3. Disconnect the applicable fuel line for the
engine configuration:
앫 ASET™ Engine with Combination
Primary/Secondary and Pre-Pump
Filters — outlet hose from the fitting at
the top of the supply pump
앫 ASET™ Engine with
Chassis-Mounted Primary and
Supply Pump-Mounted Secondary
Filters — outlet hose from the fitting at
the top of the supply pump
앫 ASET™ Engine with
Manifold-Mounted Primary and
Secondary Filters — inlet hose from
the fitting at the secondary fuel filter
4. Hand-prime the system until fuel is seen at
the disconnected hose fitting for the
applicable engine. This should take
approximately 50 hand pumps.
Excessive hand-priming after fuel is seen at the
fitting may make the engine difficult to start.
5. Reconnect the fuel hose at the supply pump
outlet fitting (if equipped) or at the secondary
fuel filter inlet fitting (if equipped).
6. Remove the hand-priming pump from the
fuel tank and perform the “Engine
Operational Check” that follows in this
section.
If the engine does not start, refill both filters and
repeat the priming procedure outlined in steps 3,
4 and 5.
Do not crank the engine continuously for more
than 30 seconds without allowing the starter to
cool for 2 minutes between cranks.
The only acceptable method of priming the fuel
system is the hand primer pump. The application
of air pressure to the fuel tank or the use of an
auxiliary pump to prime the fuel system is
PROHIBITED. These priming techniques may
result in severe engine damage caused by
leakage of fuel past the supply pump seal and
into the crankcase.
5-111.bk Page 464 Monday, July 10, 2006 2:26 PM
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