Isuzu 1999 RODEO Workshop Manual page 1342

Step
21 Is the fuel pressure indicated by the fuel pressure
gauge above the specified value?
22 1. Command the fuel pump "ON" with the Tech 2.
2. Using suitable pliers which will not damage the fuel
hose, gradually apply pressure with the pliers to
pinch the flexible fuel return hose closed.
CAUTION: Do not let the fuel pressure exceed
the second specified value.
Does the fuel pressure indicated by the fuel pressure
gauge rise above the first specified value?
23 1. Command the fuel pump "ON" with the Tech 2.
2. Remove the fuel filler cap and listen for the sound of
the fuel pump running.
3. Turn the pump off.
Was the fuel pump running?
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Fuel System Diagnosis (Cont'd)
Action Value(s) Yes
0 kPa (0 psi) Go to Step 22
376 kPa (55
psi). 414 kPa
(60 psi). Go to Step 11
— Go to Step 7
6E2–99
No
Go to Step 23
Go to Step 7
Go to Fuel
System
Electrical Test
Chart