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Home >> Suzuki >> 2005 >> Verona EX >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> Fuel System >> Fuel System >> Diagnostic Information and Procedures >> Fuel System Diagnosis >> Fuel Pressure Relief Procedure
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Fuel Pressure Relief Procedure

  1. Remove the fuel cap.
  2. Remove the fuel pump fuse from the engine fuse box.
  3. Start the engine and allow the engine to stall.
  4. Crank the engine for an additional 10 seconds.
FUEL SYSTEM DIAGNOSIS

Step Action Value(s) Yes No
1
  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 and holding steady?		 45 psi (310 kPa) Go to Step 2. Go to Step 5.
2
  1. Disconnect the fuel pressure regulator vacuum hose.
  2. Start the engine.
  3. Allow the engine to idle.
  4. Connect the fuel pressure regulator vacuum hose.

Did the fuel pressure decrease?		 - System OK Go to Step 3.
3
  1. Allow the engine to idle.
  2. Disconnect the vacuum hose from the fuel pressure regulator.
  3. Connect a vacuum pump with a gauge to the fuel pressure regulator vacuum port.
  4. Apply 41-47 kPa (12-14 in. Hg) of vacuum to the fuel pressure regulator.

Did the fuel pressure decrease?		 - Go to Step 4. Go to Step 15.
4
  1. Locate and correct the cause of the vacuum restriction to the fuel pressure regulator.
  2. Confirm the operation of the fuel pressure regulator.

Is the repair complete?		 - System OK -
5 Inspect the fuel lines for a leak.
Is the problem found?		 - Go to Step 6. Go to Step 7.
6
  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 and holding steady?		 45 psi (310 kPa) System OK -
7
  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 8. Go to Step 9.
8
  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 and holding steady?		 45 psi (310 kPa) System OK -
9 With the fuel system under pressure, inspect the fuel return outlet for leaking.
Is the problem found?		 - Go to Step 10. Go to Step 11.
10
  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 and holding steady?		 45 psi (310 kPa) System OK -
11 With the fuel system under pressure, inspect the fuel inlet for leaking.
Is the problem found?		 - Go to Step 12. Go to Step 13.
12
  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 and holding steady?		 45 psi (310 kPa) System OK -
13
  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 14. -
14
  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 and holding steady?		 45 psi (310 kPa) System OK -
15
  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.

Did the fuel pressure decrease?		 - System OK -
16 Inspect the fuel lines for leaks.
Is the problem found?		 - Go to Step 6. Go to Step 17.
17
  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 8. Go to Step 18.
18
  1. Remove the fuel pump assembly.
  2. With the fuel system under pressure, inspect the fuel return outlet for leaking.

Is the problem found?		 - Go to Step 10. Go to Step 19.
19
  1. Remove the fuel pump assembly.
  2. With the fuel system under pressure, inspect the fuel inlet for leaking.

Is the problem found?		 - Go to Step 12. Go to Step 20.
20
  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 14. -
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