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Fuel System Diagnosis: Troubleshooting

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2008 Suzuki Reno, 2008 Suzuki Forenza, 2007 Suzuki Reno, 2007 Suzuki Forenza, and 2006 Suzuki Reno. However, it is still accessible from the selected car via links, so may be relevant.
TROUBLESHOOTING

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 but not holding steady?		 379 - 393 kPa (55 - 57 psi) Go to Step 2 Go to Step 9
2 Inspect the fuel lines for a leak.
Is the problem found?		 - Go to Step 3 Go to Step 4
3
  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?		 379 - 393 kPa (55 - 57 psi) System OK -
4
  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 5 Go to Step 6
5
  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?		 379 - 393 kPa (55 - 57 psi) System OK -
6
  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?		 379 - 393 kPa (55 - 57 psi) System OK -
7
  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 8 -
8
  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?		 379 - 393 kPa (55 - 57 psi) System OK -
9
  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 specified and holding steady?		 379 - 393 kPa (55 - 57 psi) Go to Step 6 Go to Step 10
10 Inspect the fuel lines for leaks.
Is the problem found?		 - Go to Step 3 Go to Step 11
11
  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 5 Go to Step 12
12
  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 8 Go to Step 6
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