LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2003 >> Matrix Base, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Diagnostic Procedures - 4-Cylinder >> Fuel Systems >> Fuel Pressure >> Prius
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Fuel Pressure: Prius

WARNING: Read service precautions before proceeding with service procedure. See SERVICE PRECAUTIONS .
  1. Ensure battery is fully charged. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE . Disconnect negative battery cable.
  2. Purchase fuel pipe (part No. 23901-21020) from parts department. Remove fuel pipe connector from end of NEW fuel pipe. See Figure.
  3. Ensure area around fuel pipe at end of fuel rail and disconnect fitting is clean. See Fig 1.
    4. CAUTION: Use care when disconnecting fuel pipe, as some residual fuel pressure may still exist in the fuel system.
  4. Depress both sides of retainer and pull fuel pipe with disconnect fitting from fuel pipe fitting. See Fig 1.
  5. Install Fuel Pressure Gauge Set (SST 09268-45014) by using Injection Measuring Tool Set (SST 09268-41047) and fuel pipe connector between fuel pipe and fuel pipe fitting. See Figure. Ensure hose, fuel pipe and fuel pipe connector are properly connected.
  6. Install negative battery cable. Connect Toyota hand-held tester to data link connector No. 3 at driver's side of instrument panel. See Figure. Turn ignition on. DO NOT start engine.
  7. Turn hand-held tester on. Select ACTIVE TEST MODE on hand-held tester. Using hand-held tester manufacturer's instructions, operate fuel pump and note fuel pressure. If hand-held tester is not available, fuel pump may also be activated by connecting battery voltage to specified terminals on fuel pump. See Figure. Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm2 ).
  8. If fuel pressure is within specification, go to next step. If fuel pressure exceeds specification, fuel pressure regulator is defective. Fuel pressure regulator is mounted on fuel pump in the fuel tank. It may be necessary to replace fuel pressure regulator, fuel pump and fuel tank as an assembly. Consult parts department for parts availability. If fuel pressure is less than specified, check for leaking fuel hoses or connections or defective fuel pump.
  9. Turn ignition off. Remove hand-held tester. Start engine and allow engine to idle. Note fuel pressure with engine idling. Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm2 ).
  10. Shut engine off and note fuel pressure. Fuel pressure should remain at least 21 psi (1.5 kg/cm2 ) for a minimum of 5 minutes. If fuel pressure is within specification and holds as specified, go to next step. If fuel pressure is not within specification or does not hold as specified, check for defective fuel pump or defective fuel injector.
  11. Release fuel pressure. Disconnect negative battery cable. Remove adapter, hose, fuel pressure gauge and fuel pipe connector.
    12. CAUTION: DO NOT reuse old retainer when installing fuel pipe on fuel pipe fitting. Always use a NEW retainer.
  12. Apply light coat of engine oil on tip of fuel pipe fitting to allow for ease of disconnect fitting and fuel pipe installation. Using NEW retainer, install fuel pipe on fuel pipe fitting until "click" sound is heard. DO NOT reuse old retainer. Pull on fuel pipe to ensure fuel pipe is properly locked on fuel pipe fitting.
  13. Install negative battery cable. Check for fuel leaks by activating the fuel pump by using hand-held tester or connecting battery voltage to fuel pump.
    Fig 1: Locating Fuel Pipe, Disconnect Fitting & Disconnecting Fuel Pipe From Fuel Pipe Fitting (Prius)
    G00011396Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
scientia non olet · About LEMON Manuals