Daewoo Nubira Owner's Manual page 175

Step
16
1. Replace the fuel pressure regulator.
2. Disconnect the fuel pressure regulator vacuum
hose.
3. Start the engine.
4. Allow the engine to idle.
5. Connect the fuel pressure regulator vacuum
hose.
Does the fuel pressure decrease?
17
1. Relieve the fuel system pressure.
2. Install a fuel pressure gauge.
3. Turn the ignition ON.
Is the fuel system pressure below the values speci-
fied and holding steady?
18
1. Relieve the fuel system pressure.
2. Install a fuel pressure gauge.
3. Turn the ignition ON.
Is the fuel system pressure below the values speci-
fied and holding steady?
19 Inspect the fuel lines for leaks.
Is the problem found?
20
1. Remove the fuel pump assembly.
2. With the fuel pump under pressure, inspect the
fuel pump coupling hoses for leaking.
Is the problem found?
21
1. Remove the fuel pump assembly.
2. With the fuel system under pressure, inspect
the fuel return outlet for leaking.
Is the problem found?
22
1. Remove the fuel pump assembly.
2. With the fuel system under pressure, inspect
the fuel inlet for leaking.
Is the problem found?
23
1. Remove the fuel rail and the fuel injectors as
an assembly.
2. With the fuel system under pressure, inspect
all of the fuel injectors for leaking.
Is the problem found?
DAEWOO V–121 BL4
Action
ENGINE CONTROLS 1F – 51
Value(s) Yes
System OK
284–325 kPa Go to Step 13
(41–47 psi)
284–325 kPa Go to Step 19
(41–47 psi)
Go to Step 7
Go to Step 9
Go to Step 11
Go to Step 13
Go to Step 15
No
Go to Step 18
Go to Step 20
Go to Step 21
Go to Step 22
Go to Step 23
Go to Step 13