Isuzu 1999 RODEO Workshop Manual page 1341

6E2–98
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Step
10 Locate and repair the loss of vacuum to the fuel
pressure regulator.
Is the action complete?
11 Replace the fuel pressure regulator.
Is the action complete?
12 1. Run the fuel pump with the Tech 2.
2. After pressure has built up, turn off the pump and
clamp the supply hose shut with suitable locking
pliers which will not damage the hose.
Does the fuel pressure indicated by the fuel pressure
gauge remain constant?
13 Visually inspect the fuel supply line and repair any
leaks.
Was a problem found?
14 Remove the fuel tank and inspect for leaky hose or
in-tank fuel line.
Was a problem found?
15 1. If the pliers are still clamped to the fuel supply hose,
remove the locking pliers.
2. With suitable locking pliers which will not damage
the hose, clamp the fuel return line to prevent fuel
from returning to the fuel tank.
3. Run the fuel pump with the Tech 2.
4. After pressure has built up, remove power to the
pump.
Does the fuel pressure indicated by the fuel pressure
gauge remain constant?
16 Locate and replace any leaking fuel injector(s).
Is the action complete?
17 Is the fuel pressure indicated by the fuel pressure
gauge above the specified limit?
18 1. Relieve the fuel pressure.
Pressure Relief.
2. Disconnect the fuel return line from the fuel rail.
3. Attach a length of flexible hose to the fuel rail return
outlet passage.
4. Place the open end of the flexible hose into an
approved gasoline container.
5. Run the fuel pump with the Tech 2.
6. Observe the fuel pressure indicated by the fuel
pressure gauge with the fuel pump running.
Is the fuel pressure within the specified limits?
19 Locate and correct the restriction in the fuel return line.
Is the action complete?
20 Visually and physically inspect the fuel rail outlet
passages for a restriction.
Was a restriction found?
Fuel System Diagnosis (Cont'd)
Action
Refer to the Fuel
Value(s) Yes
— Verify repair
— Verify repair
— Go to Step 13
— Verify repair
— Verify repair
— Go to Step 11
— Verify repair
376 kPa (55
Go to Step 18
psi)
290-376 kPa
Go to Step 19
(42-55 psi)
— Verify repair
— Verify repair
No
—
—
Go to Step 15
Go to Step 14
Go to Step 8
Go to Step 16
—
Go to Step 21
Go to Step 20
—
Go to Step 11