Daewoo NUBIRA - Page 174

1F – 50IENGINE CONTROLS
DAEWOO V–121 BL4
Step NoYesValue(s)Action
5
1. Relieve the fuel system pressure.
2. Install a fuel pressure gauge.
3. Turn the ignition ON.
Is the fuel pressure within the values specified but
not holding steady?
284–325 kPa
(41–47 psi)
Go to Step 6 Go to Step 17
6 Inspect the fuel lines for a leak.
Is the problem found?
Go to Step 7 Go to Step 8
7
1. Replace the fuel line(s) as needed.
2. Install a fuel pressure gauge.
3. Turn the ignition ON.
Is the fuel pressure within the values specified but
not holding steady?
284–325 kPa
(41–47 psi)
System OK
8
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?
Go to Step 9 Go to Step 10
9
1. Tighten or replace the fuel pump coupling
hoses as needed.
2. Install a fuel pressure gauge.
3. Turn the ignition ON.
Is the fuel pressure within the values specified but
not holding steady?
284–325 kPa
(41–47 psi)
System OK
10 With the fuel system under pressure, inspect the fuel
return outlet for leaking.
Is the problem found?
Go to Step 11 Go to Step 12
11
1. Replace the fuel pressure regulator.
2. Install a fuel pressure gauge.
3. Turn the ignition ON.
Is the fuel pressure within the values specified but
not holding steady?
284–325 kPa
(41–47 psi)
System OK
12 With the fuel system under pressure, inspect the fuel
inlet for leaking.
Is the problem found?
Go to Step 13 Go to Step 14
13
1. Replace the fuel pump assembly.
2. Install a fuel pressure gauge.
3. Turn the ignition ON.
Is the fuel pressure within the values specified but
not holding steady?
284–325 kPa
(41–47 psi)
System OK
14
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?
Go to Step 15
15
1. Replace the leaking fuel injector(s).
2. Install a fuel pressure gauge.
3. Turn the ignition ON.
Is the fuel pressure within the values specified but
not holding steady?
284–325 kPa
(41–47 psi)
System OK