Chrysler DODGE D150 1993 Service Manual page 826

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FUEL SYSTEM 14 - 7
Fig. 1"f Adapter Tool—Typical Connection
propriate Powertrain Diagnostic Procedures service
manual for DRB II operation.
(8) M O M E N T A R I L Y pinch the rubber hose por­
tion of adapter tool 6539. Pressure should rise to ap­
proximately 75 psi within two (2) seconds. D O N O T
pinch hose for longer t h a n five seconds.
If fuel pump pressure rises to approximately 75 psi
within two seconds, pump is operating at its maxi­
mum and is correct.
If fuel pump pressure does not rise to approxi­
mately 75 psi within two seconds, proceed as follows:
(9) Release fuel system pressure. Refer to the pre­
vious Fuel Pressure Release Procedure in this group.
(10) Raise and support vehicle.
(11) Disconnect fuel supply line at inlet (fuel t a n k
side) of fuel filter. Connect Fuel Line (Tube) Pressure
Test Adapter Tool number 6631 (3/8 in.) between fuel
filter and fuel supply line.
W A R N I N G : T H E F U E L S Y S T E M P R E S S U R E IN T H E
F O L L O W I N G T E S T M A Y E X C E E D 100 P S I . B E F O R E
S T A R T I N G TEST, V E R I F Y G O O D C O N N E C T I O N S A T
E N D S O F A D A P T E R T O O L 6631. B E S U R E T O O L I S
L O C K E D O N T O F U E L FILTER A N D F U E L S U P P L Y
LINE. PULL FIRMLY O N E N D S O F T O O L T O V E R ­
IFY.
(12) To activate the fuel pump and pressurize the
system, obtain the DRB II scan tool. Refer to the ap­
propriate Powertrain Diagnostic Procedures service
manual for DRB II operation.
M O M E N T A R I L Y pinch the rubber hose portion of
adapter tool 6631. Pressure should rise to approxi­
mately 75 psi within two (2) seconds. D O N O T pinch
hose for longer t h a n five seconds.
If fuel pump pressure now rises to approximately
75 psi within two seconds, but this pressure could not
be met at the fuel rail, check for a plugged or re­
stricted fuel filter. Also check the fuel supply line be­
tween fuel filter and fuel rail for kinks or
obstructions. Proceed to the Fuel P u m p Capacity
Test.
FUEL SYSTEM PRESSURE TEST—5.9L ENGINE
Fuel systems on vehicles equipped with a 5.9L en­
gine are equipped with a fuel t a n k module mounted,
combination fuel filter/fuel pressure regulator (Fig.
12). The fuel pressure regulator is not controlled by
engine vacuum.
ROLLOVER VALVE J9314-167
Fig. 12 Fuel Filter/Fuel Pressure Regulator—5.9L
Engine
With engine at idle speed, system fuel pressure
should be approximately 241-310 kPa (35-45 psi).
(1) Remove the protective cap at the fuel rail (Fig.
13). Connect the 0-414 kPa (0-60 psi) fuel pressure
gauge (from Gauge Set 5069) to test port pressure fit­
ting on fuel rail (Fig. 14).
Fig. 13 Fuel Pressure Test Port—5.9L Engines
(2) Note pressure gauge reading. Fuel pressure
should be approximately 241-310 k P a (35-45 psi) at
idle.