Dodge ram truck 3500 1996 Service Manual page 1312

14 -
78
FUEL
SYSTEM
B R
DIAGNOSIS AND TESTING (Continued)
FUEL
PRESSURE
GAUGE
FUEL
DRAIN
MANIFOLD
LINE
LINE
J9514-69
Fig. 18 installing Special Tools
(c) Connect vacuum gauge 6828 to T-fitting (Fig,
21).
(d) Start the engine and observe the vacuum
gauge. The vacuum gauge will not indicate a vac­
uum until the transfer pump begins to operate at
full capacity.
FUEL
TRANSFER
FUEL
HEATER
RUBBER
FUEL HOSE
J9514-72
Fig. 19 Rubber Fuel Hose—Pump to Heater
NOTE: Under load, maximum inlet restriction must
not exceed approximately 100 mm Hg (4 in. Hg).
(8) I f the restriction is higher than the specifica­
tions, check for a kinked fuel line or a plugged fuel
tank vent. A partially clogged in-tank fuel filter can
also cause excess vacuum. Repair as necessary.
(9) Remove vacuum gauge and adapter hose tool.
FUEL
TRANSFER
PUMP
FUEL
HEATER
SPECIAL HOSE
ADAPTER TOOL
6 8 3 7
J9514-73
Fig. 20 Installing Hose Adapter
T-FITTING
J9514-74
Fig. 21 Installing Vacuum Gauge
(10) Install rubber fuel hose and clamps between
heater and pump.
FUEL VOLUME TEST
Fuel volume-versus-engme cranking rpm are used
for the test.
WARNING: TO PREVENT T H E ENGINE FROM
STARTING, DISCONNECT THE PIGTAIL HARNESS
AT THE F U E L SHUTDOWN SOLENOID (Fig. 22). U S E
CAUTION A S RESIDUAL F U E L MAY C A U S E THE
ENGINE TO START AND RUN TEMPORARILY.
ATTEMPT TO START T H E ENGINE A F E W TIMES
UNTIL IT QUITS B E F O R E PERFORMING T H E F U E L
VOLUME T E S T .
(1) Connect a hand held tachometer to the engine.
Use Cummins part number 3377462 or an equiva­
lent.
(2) Remove the clamp bolt retaining the fuel drain
manifold line to the cylinder head (Fig. 17).