1999 Lexus SC 300FACTORY OEM SERVICE PROCEDURE

Fuel Pressure Release

  1. On ES300, GS300 & GS400, remove rear seat cushion and cover plate on floor panel for access to electrical connector for fuel pump. Disconnect electrical connector for fuel pump. This is electrical connector for fuel pump and fuel gauge sending unit. Go to step  5.
  2. On LS400, SC300 and SC400, remove trunk floor mat. Remove trunk trim cover from behind rear seat in the trunk for access to the fuel tank. Disconnect 2-pin electrical connector for fuel pump. Electrical connector for fuel pump is located near the rear speaker and fuel pump is located on front of fuel tank, behind rear seat. See Figure and Figure . Go to step  5.
  3. On LX470, disconnect electrical connector for fuel pump. See Fig 1. This is electrical connector for fuel pump and fuel gauge sending unit. Go to step  5.
  4. On RX300, remove driver's side rear seat. Remove carpet and cover plate on floor panel for access to electrical connector for fuel pump. Disconnect electrical connector for fuel pump. This is electrical connector for fuel pump and fuel gauge sending unit and is located on top of fuel tank, near fuel pump. Go to next step.
  5. On all models, start engine and allow engine to idle until engine stalls. Turn ignition off. Reinstall electrical connector for fuel pump and any removed components.
  6. Disconnect negative battery cable. Place suitable container under fuel line connection. Cover fuel line connection with shop towel. Slowly loosen fuel line connection, allowing any fuel pressure to be released. Once fuel pressure is released, fuel system components may be serviced.
    Fig 1: Locating Fuel Pump Electrical Connector (LX470)
    G98H11236Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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