Dodge RAM TRUCK 1500 1995 Service Manual page 1184

1 4 - 1 0 2 GENERAL DIAGNOSIS—DIESEL ENGINE
fuel tank and the transfer pump. Inspect the fuel
tank and fuel lines for damage that might allow air
into the system.
For air bleeding, refer to the Air Bleed Procedure
in the Diesel Engine—Component Removal/Installa­
tion section of this group.
AUTOMATIC SHUTDOWN (ASD) RELAY TEST
To perform a complete test of the ASD relay and its
circuitry, refer to the DRB scan tool and appropriate
Powertrain Diagnostics Procedures manual. To test
the relay only, refer to Relays—Operation/Testing in
this section of the group.
ENGINE SPEED SENSOR TEST
To perform a complete test of this sensor and its
circuitry, refer to the appropriate Powertrain Diag­
nostic Procedures manual.
FUEL FILTER/WATER SEPARATOR TEST
A blocked or clogged fuel filter/water separator can
cause starting problems and prevent the engine from
revving up. It can also cause, low power and blue or
white fog like exhaust.
The maximum allowable fuel pressure drop across
the fuel filter/water separator is 35 kPa (5 psi). This
can be checked with a fuel pressure gauge connected
to the inlet and outlet sides of the upper part of the
filter base with special fuel line adapter fittings.
To test fuel pressure drop:
(1) Remove the clamp bolt retaining the fuel drain
manifold line to the cylinder head (Fig. 8).
(2) Remove the rear banjo fitting bolt at the inlet
line (Fig. 8).
(3) Position the fuel drain manifold line (Fig. 8) to
the rear.
(4) Install and tighten special adapter tool 6829
into the top of the fuel inlet line (Fig. 9).
(5) Install a 0-60 or 0-100 psi fuel pressure gauge
to adapter tool 6829 (Fig. 9).
(6) Start engine and record fuel pressure. Mini­
mum pressure should be 172 kPa (25 psi). If not, re­
fer to Fuel Transfer Pump Pressure Test for more
information
(7) Remove fuel pressure gauge and adapter tool.
(8) Connect banjo fittings together at fuel inlet line
with bolt.
(9) Remove the front banjo fitting bolt at the outlet
line (Fig. 8).
(10) Install and tighten special adapter tool 6829
into the top of the fuel outlet line (Fig. 10).
(11) Install fuel pressure gauge to adapter tool
6829 (Fig. 10).
(12) Start engine and record fuel pressure.
(13) Compare the 2 pressures. It must not exceed
35
kPa
(5
psi).
Fig. 9 installing Special Tools
If pressure specification has been exceeded, replace
fuel filter and check for line restrictions.
If the instrument panel mounted water-in-fuel
warning lamp is illuminated with the ignition key
ON, it indicates that excess water has collected in