Daewoo NUBIRA, User Manual

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1F – 40 I ENGINE CONTROLS
DAEWOO V–121 BL4
Step No Yes Value(s) Action
35
1. Turn the ignition OFF.
2. Disconnect the electrical connector at the fuel
pump.
3. Connect a test light between the fuel pump
connector terminals 3 and 2.
4. Turn the ignition ON.
5. With the ignition ON, the test light should light
for the time specified.
Is the test light on?
2 sec Go toStep 36 Go toStep 46
36 Replace the fuel pump.
Is the repair complete? Go toStep 2
37 Is the fuel pressure within the value specified? 283–324 kPa
(41–47 psi)
Go toStep 41 Go toStep 38
38
1. Check the fuel filter for a restriction.
2. Inspect the fuel lines for kinks and restrictions.
Is the problem found?
Go toStep 39 Go toStep 40
39
1. Replace the fuel filter and/or the fuel lines as
needed.
2. Connect a fuel pressure gauge.
3. Crank the engine.
Is the fuel pressure within the value specified?
283–324 kPa
(41–47 psi)
Go toStep 2 Go toStep 40
40
1. Disconnect the vacuum line from the fuel pres-
sure regulator.
2. Inspect the vacuum line for the presence of
fuel.
3. Inspect the fuel pressure regulator vacuum port
for the presence of fuel.
Is any fuel present?
Go toStep 43 Go toStep 44
41 Check the fuel for contamination.
Is the fuel contaminated? Go toStep 42 Go toStep 58
42
1. Remove the contaminated fuel from the fuel
tank.
2. Clean the fuel tank as needed.
Is the repair complete?
Go toStep 2
43 Replace the fuel pressure regulator.
Is the repair complete? Go toStep 2
44
1. Remove the fuel pump assembly from the fuel
tank.
2. Inspect the fuel pump sender and the fuel cou-
pling hoses for a restriction.
3. Inspect the in–tank fuel filter for a restriction.
Is the problem found?
Go toStep 45 Go toStep 36
45 Replace the fuel pump sender, the in–tank fuel filter,
and/or the fuel coupling hoses as needed.
Is the repair complete? Go toStep 2