Fuel
System Malfunction - Diagnosis
Page
14-12
Fuel
System
DODGE
Turbo Diesei
It is normal to have entrapped air
in
the fuel
lines
after replacing
the pump or the
lines.
Air in the lines will
cause
the engine to
run rough or produce a fuel knock.
^ft] Bleed the air
from
the high pressure line at the
fitting
that
connects
the injector.
With
the engine running or cranking,
bleed one line at a
time
until the engine runs smooth.
If the air cannot be removed, check the pump and supply line
for
suction
leaks.
Injectors
Caution:
Use only the specified Injector for the engine.
AH engines use Robert
Bosch,
17mm dosed nozzles, hole-type
injectors.
The injectors however, can have different part
numbers for different engine ratings. The last four digits of the
Cummins
part number are
used
to identify the injectors.
Note:
The XXXX
shows
location only. This number
can
change.
Contact
your
local
Dodge Dealer to verify correct numbers.
IS
During the injection
cycle,
the injection pressure
increases
to
the 'pop" pressure level. The "pop" pressure Is the pressure
required to
lift
the injector needle valve off its seat.
With
the
injector needle valve off its seat, fuel is injected into the
cylinder. A spring is used to force the needle valve
closed
as
the injection pressure drops below the "pop" pressure. The
injector nozzle
is
sealed
after injection.
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