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Fuel Pressure: RX300

  1. Ensure battery is fully charged. Release fuel pressure. See FUEL PRESSURE RELEASE . Disconnect negative battery cable.
  2. Purchase a No. 1 fuel pipe Part No. (23801-20040) from parts department. No. 1 fuel pipe is fuel pipe that fits between fuel rails and fuel inlet pipe. See Fig 1. Remove fuel pipe connector from end of NEW No. 1 fuel pipe. See Figure.
    Fig 1: Locating No. 1 Fuel Pipe, Fuel Pipe Clamp & Fuel Inlet Pipe (RX300)
    G99J50566Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Remove fuel pipe clamp from No. 1 fuel pipe at fuel inlet pipe. See Fig 1. Ensure area around No. 1 fuel pipe and fuel inlet pipe is clean.
    4. CAUTION: Use care when disconnecting No. 1 fuel pipe from fuel inlet pipe, as some residual fuel pressure may still exist in the fuel system.
  4. Depress both sides of retainer and pull No. 1 fuel pipe with disconnect fitting from fuel inlet pipe. See Fig 2.
  5. Install Adapter (SST 09268-41250), hose and fuel pressure gauge from Fuel Pressure Gauge Set (SST 09268-45012) with fuel pipe connector between No. 1 fuel pipe and fuel inlet pipe. See Fig 3. Ensure hose, No. 1 fuel pipe and fuel pipe connector are properly connected.
  6. Install negative battery cable. Connect scan tool to Data Link Connector (DLC) No. 3, located under left side of instrument panel. Turn ignition on. DO NOT start engine.
  7. Turn scan tool on. Select ACTIVE TEST MODE on scan tool. Using scan tool manufacturer's instructions, activate fuel pump and note fuel pressure. Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm2 ).
    NOTE: Fuel pump may also be activated by connecting battery voltage to specified terminals on fuel pump. See Figure.
  8. If fuel pressure is within specification, go to next step. If fuel pressure exceeds specification, replace fuel pressure regulator mounted on fuel pump in the fuel tank. See FUEL SYSTEM in REMOVAL, OVERHAUL & INSTALLATION article. If fuel pressure is less than specified, check for leaking fuel hoses or connections, restricted fuel filter, defective fuel pump or defective fuel pressure regulator.
  9. Remove scan tool from DLC No. 3. Start engine and note fuel pressure with engine idling. Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm2 ). 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, fuel injector or fuel pressure regulator.
  10. Release fuel pressure. Disconnect negative battery cable. Remove adapter, hose, fuel pressure gauge and fuel pipe connector.
  11. Install No. 1 fuel pipe on fuel inlet pipe. Pull on No. 1 fuel pipe to ensure fuel pipe is properly locked on fuel inlet pipe. Reinstall fuel pipe clamp until "click" sound is heard. Pull upward on fuel pipe clamp to ensure fuel pipe clamp is securely locked on fuel inlet pipe. Install negative battery cable. Check for fuel leaks by using scan tool to energize fuel pump.
Fig 2: Disconnecting No. 1 Fuel Pipe From Fuel Inlet Pipe (RX300)
G99A50567Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 3: Installing Fuel Pressure Gauge (RX300)
G99B50568Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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