Dodge ram truck 3500 1996 Service Manual page 1313

B R FUEL SYSTEM 14 - 7?
D I A G N O S I S A N D T E S T I N G ( C o n t i n u e d )
FRONT OF ENGINE
AIR TEMPERATURE
SENSOR
SENSOR
ELECTRICAL
CONNECTOR
INTAKE
MANIFOLD
(UPPER HALF) SHUTDOWN SOLENOID
SOLENOID ELECTRICAL
CONNECTOR
J9414-93
Fig. 22 Fuel Shutdown Solenoid Electrical
Connector
(3) Remove the rear banjo fitting bolt at the inlet
line (Fig. 17).
(4) Position the fuel drain manifold line (Fig. 17)
to the rear.
(5) Install and tighten special adapter tool 6836
into the top of the fuel inlet line (Fig. 23).
(6) Connect a temporary rubber fuel hose to
adapter 6836 (Fig. 23).
TEMPORARY
RUBBER
HOSE
GRADUATED
J9514-75 CONTAINER
Fig. 23 Performing Fuel Volume Test
(7) Place the other end of this temporary hose into
a graduated container (Fig. 23).
(8) Crank the engine for 30 seconds. Measure the
fuel volume in the container after 30 seconds of
engine cranking time. Do not crank the engine for
more than 30 seconds at a time. Starter motor
damage may result.
(9) To determine the correct fuel volume, refer to
for Fuel Volume Specification. To use the chart in
(Fig. 24), refer to the following procedure:
• Draw a straight vertical line at the measured
rpm.
• Draw a straight horizontal line at the measured
fuel volume.
• I f these two lines intersect below the flow line
(Fig. 24), this indicates a defective transfer pump or
a line restriction.
• I f these two lines intersect above the flow line
(Fig. 24), this indicates acceptable fuel flow.
ml
FLOW UNE
625
6 0 0
5 7 5
5 5 0
5 2 5
500
4 7 5
4 5 0
4 2 5
400
3 7 5
3 5 0
325
3 0 0
275
200
225 250 275 300 400
Engine Cranking
Speed (RPM)
j9414.no
Fig. 24 Fuel Volume Specifications
FUEL FILTER/WATER SEPARATOR TEST
A blocked or clogged fuel filter/water separator can
cause starting problems and prevent the engine from
revving up. I t 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. 25).
c
O
u
m
t o
o
CO
m
£
3
i
m
D