Dodge RAM TRUCK 1500 1995 Service Manual page 1187

BR
Fig. 14 inspecting Injector Operation
FUEL
CONTAINER
J9514-71
Fig. 15 Typical Fuel Injector Tester
- FUEL INJECTION PUMP TEST
The fuel shutdown solenoid is the only serviceable
component of the fuel injection pump. The injection
pump is not to be serviced or the warranty may
be voided. If the injection pump requires ser­
vice, the complete assembly must be replaced.
Incorrect injection pump timing can cause poor per­
formance, excessive smoke and emissions and poor
fuel economy.
A defective fuel injection pump or misadjusted
pump timing can cause starting problems or prevent
the engine from revving up. It can also cause:
• Engine surge at idle
• Rough idle (warm engine)
• Low power
• Excessive fuel consumption
GENERAL DIAGNOSIS—DIESEL ENGINE 14 - 105
® Poor performance
o Low power
o Black smoke from the exhaust
® Blue or white fog like exhaust
o Incorrect idle or maximum speed
Engine power is also effected by the governor set­
ting and performance. Do not attempt to adjust
the governor. If the governor seals on the exter­
nal adjustment screw are broken, the fuel rate
may be out of adjustment. The warranty of the
injection pump and the engine may be void if
the seals have been tampered with or removed.
For removal and installation procedures, refer to
the Diesel Engine—Component Removal/Installation
section of this group.
FUEL SUPPLY RESTRICTIONS
LOW-PRESSURE LINES
Fuel supply line restrictions or a defective fuel
transfer pump can cause starting problems and pre­
vent the engine from revving up. The starting prob­
lems include; low power and blue or white fog like
exhaust. Test all fuel supply lines for restrictions or
blockage. Flush or replace as necessary. Bleed the
fuel system of air once a fuel supply line has been re­
placed. Refer to the Air Bleed Procedure section of
this group for procedures. Also refer to the Fuel
Transfer Pump Pressure Test section of this group for
restriction tests.
HIGH-PRESSURE LINES-
Restricted (kinked or bent) high-pressure lines can
cause starting problems, poor engine performance
and black smoke from exhaust.
Examine all high-pressure lines for any damage.
Each radius on each high-pressure line must be
smooth and free of any bends or kinks.
Replace damaged, restricted or leaking high-pres­
sure fuel lines with the correct replacement line.
CAUTION: The high-pressure fuel lines must be
clamped securely in place in the holders. The lines
cannot contact each other or other components. Do
not attempt to weld high-pressure fuel lines or to
repair lines that are damaged. Only use the recom­
mended lines when replacement of high-pressure
fuel line is necessary.
FUEL SHUTDOWN SOLENOID TEST
For an operational description (electrical and me­
chanical) of the solenoid, refer to the Diesel Engine—
Component Description/System Operation section of
this group.