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Home >> Suzuki >> 2003 >> Vitara 4D Utility, RWD, Standard >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> Fuel System >> Repair Instructions >> Fuel Pressure Inspection
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Fuel Pressure Inspection

  1. Relieve fuel pressure in fuel feed line referring to FUEL PRESSURE RELIEF PROCEDURE  .
  2. Using backup wrench, loosen plug bolt on fuel delivery pipe and remove it. Connect special tools (fuel pressure gauge) to delivery pipe.
    CAUTION: A small amount of fuel may be released when plug bolt is loosened. Place container under the bolt or cover bolt hole with a shop cloth so that released fuel is caught in container or absorbed in cloth. Place that cloth in an approved container.

    Special tool 

    1. (A):  09912-58441
    2. (B):  09912-58431
    3. (C):  09919-46010
    Fig 1: Connecting Fuel Pressure Gauge To Fuel Delivery Pipe
    G01352069Courtesy of SUZUKI OF AMERICA CORP.
  3. Check that battery voltage is above 11 volts.
  4. Turn ignition switch ON to operate fuel pump and after 3 seconds turn it OFF. Repeat this 3 or 4 times and then check fuel pressure.
  5. Start engine.
  6. Measure fuel pressure at idling.

    If measured pressure doesn't satisfy specification, refer to "Fuel Pressure Inspection:" and check each possibly defective part. Replace if found defective.

    Fuel pressure specification

    Fuel Pressure Specifications

    Condition Fuel pressure
    With fuel pump operating and engine  250-300 kPa (2.5-3.0 kg/cm 2  ,35.6-42.7 psi) 
    At specified speed  210-260 kPa (2.1-2.6 kg/cm 2  ,29.9-37.0 psi) 
    With 1 min. after engine (fuel pump) stop (pressure reduces as time passes)  Over 180 KPa (1.8 Kg/cm 2  ,25.6 psi) 
  7. After checking fuel pressure, remove fuel pressure gauge.
    CAUTION: As fuel feed line is still under high fuel pressure, make sure to release fuel pressure according to the following procedures.
    • Place fuel container under joint.
    • Cover joint with rag and loosen joint nut slowly to release fuel pressure gradually.
    Fig 2: Releasing Fuel Pressure
    G01352070Courtesy of SUZUKI OF AMERICA CORP.
  8. Install plug bolt to fuel delivery pipe. Use new gasket. Tighten it to specified torque, using backup wrench.

    Tightening torque 

    1. Fuel delivery pipe plug bolt (a):  30 N.m (3.0 kg-m, 22.0 lb-ft)
    Fig 3: Installing Plug Bolt To Fuel Delivery Pipe
    G01352071Courtesy of SUZUKI OF AMERICA CORP.
  9. With engine "OFF" and ignition switch "ON", check for fuel leaks.
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