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Grand Vitara

NOTE: Before performing fuel pressure inspection procedure, ensure battery is in good condition and fully charged.
  1. Using a mechanic's stethoscope at gas tank, check for fuel pump operation sound when ignition switch is turned ON. If fuel pump operation sound is heard for 3 second and stops, go to next step. If fuel pump operation sound is not heard, go to B-3: FUEL PUMP CIRCUIT INSPECTION  .
  2. Check fuel pressure, see appropriate fuel pressure test under FUEL PRESSURE  . If fuel pressure is 38.4-44.0 psi (2.7-3.1 kg/cm2 ), go to next step. If fuel pressure is not 38.4-44.0 psi (2.7-3.1 kg/cm2 ), go to step  6 .
  3. After testing fuel pressure and fuel pump stops, fuel system should hold 29 psi (2.0 kg/cm2 ) of pressure or greater for one minute. If fuel pressure holds as specified, go to next step. If fuel pressure does not holds as specified, go to step  5 .
  4. Start engine and allow it to reach normal operating temperature. Check fuel pressure with engine running at idle speed. Fuel pressure should be 30.4-44.9 psi (2.1-3.1 kg/cm2 ). If fuel pressure is as specified, system is operating properly. If fuel pressure is not as specified, check for clogged vacuum hose passage to fuel pressure regulator or faulty fuel pressure regulator. Repair or replace as necessary. After repair, retest system for normal operation.
  5. Check for fuel leaks at fuel feed hose, pipe or connections. If leaks are present, repair or replace as necessary. If no leaks are present, check fuel leakage from fuel injectors, fuel pressure regulator and/or fuel pump, repair or replace as necessary. After repair, retest system for normal operation.
  6. If fuel pressure is greater than 38.4-44.0 psi (2.7-3.1 kg/cm2 ), go to next step. If fuel pressure is lower than 38.4-44.0 psi (2.7-3.1 kg/cm2 ), go to step  8 .
  7. Disconnect fuel return hose from fuel pressure regulator. Connect a separate hose to pressure regulator and insert hose end into a container. Turn ignition switch to ON position. If fuel pressure is 38.4-44.0 psi (2.7-3.1 kg/cm2 ), repair or replace restriction in fuel return hose. If fuel pressure is not as specified, replace fuel pressure regulator. See FUEL PRESSURE REGULATOR under FUEL SYSTEM in REMOVAL & INSTALLATION article. After repair, retest system for normal operation.
  8. Pinch fuel return hose. Turn ignition switch to ON position. If fuel pressure is 63.9 psi (4.5 kg/cm2 ) or greater, replace fuel pressure regulator. See FUEL PRESSURE REGULATOR under FUEL SYSTEM in REMOVAL & INSTALLATION article. If fuel pressure is lower than 63.9 psi (4.5 kg/cm2 ), check for clogged fuel filter, restricted fuel feed hose, faulty fuel pump or fuel leakage at hose connection in fuel tank. Repair or replace as necessary. After repair, retest system for normal operation.
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