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Fuel Pressure: Lx470

  1. Ensure battery is fully charged. Release fuel pressure. See FUEL PRESSURE RELEASE . Disconnect negative battery cable.
  2. Remove cover located on top of engine to gain access to front fuel pipe at front of driver's side fuel rail. See Fig 1.
  3. Remove union bolt with gaskets, and disconnect front fuel pipe from front of driver's side fuel rail. It may be necessary to remove retaining bolt at center of front fuel pipe when disconnecting front fuel pipe from driver's side fuel rail.
  4. Install Union (SST 90405-06167), Adapter (SST 09268-41190) and fuel pressure gauge from Fuel Pressure Gauge Set (SST 09268-45014) with front fuel pipe on driver's side fuel rail. See Fig 2. Tighten adapter to 29 ft. lbs. (39 N.m).
  5. 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.
  6. 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 38-44 psi (2.7-3.1 kg/cm2 ).
    NOTE: Fuel pump may also be activated by connecting battery voltage to specified terminals on fuel pump. See Figure.
  7. If fuel pressure is within specification, go to next step. If fuel pressure exceeds specification, replace fuel pressure regulator mounted near center of passenger's side fuel rail. 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.
  8. Start engine. Note fuel pressure with engine idling. Fuel pressure should be 38-44 psi (2.7-3.1 kg/cm2 ). If fuel pressure is within specification, go to next step. If fuel pressure is not within specification, check for defective vacuum hose or fuel pressure regulator.
  9. 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 holds as specified, go to next step. If fuel pressure 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 union, adapter and fuel pressure gauge from driver's side fuel rail. Using NEW gaskets, install front fuel pipe on driver's side fuel rail. Tighten union bolt to 29 ft. lbs. (39 N.m) and retaining bolt for front fuel pipe (if loosened) to 66 INCH lbs. (7.5 N.m).
  11. Install negative battery cable. Check for fuel leaks by using scan tool to energize fuel pump. Install engine cover.
Fig 1: Locating Front Fuel Pipe & Driver's Side Fuel Rail (LX470)
G98I11237Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Installing Fuel Pressure Gauge (LX470)
G98J11238Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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