Injectors - Dodge D250 1990 Service Manual

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.