Dodge RAM TRUCK 1500 1995 Service Manual page 1190

14 -108 GENERAL DIAGNOSIS—DIESEL ENGINE
Fig. 21 installing Special Tools
Fig. 22 Rubber Fuel Hose—Pump to Heater
(a) Remove the rubber fuel hose and clamps lo­
cated between the fuel heater and fuel transfer
pump (Fig. 22).
(b) Install special hose adapter tool 6837 be­
tween the disconnected fittings on the heater and
transfer pump (Fig. 23). Install clamps to hose tool
6837.
(c) Connect vacuum gauge 6828 to T-fitting as
shown in figure 24.
(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.
Inlet restriction
m u s t
not exceed
100
mm Hg
(4
in. Hg).
If the restriction is higher than the specifications,
check for a kinked fuel line or a plugged fuel tank
SIR
Fig. 23 Installing Hose Adapter
Fig. 24 installing Vacuum Gauge
vent. A partially clogged in-tank fuel filter can also
cause excess vacuum. Repair as necessary.
(8) Remove vacuum gauge and adapter hose tool.
(9) Install rubber fuel hose and clamps between
heater and pump.
FUEL VOLUME TEST
Fuel volume-versus-engine cranking rpm are used
for the test.
WARNING: TO P R E V E N T THE ENGINE FROM
STARTING, DISCONNECT THE PIGTAIL H A R N E S S
AT THE F U E L SHUTDOWN SOLENOID ( F I G . 25).
U S E CAUTION A S RESIDUAL F U E L IN THE F U E L
INJECTION PUMP MAY C A U S E THE ENGINE TO
START AND RUN TEMPORARILY. CONTINUE TO
RUN T H E ENGINE UNTIL IT QUITS B E F O R E P E R ­
FORMING THE F U E L VOLUME TEST.
(1) Connect a hand held tachometer to the engine.
Use Cummins part number 3377462 or an equiva­
lent.