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Fuel Pressure: Tacoma

  1. Ensure battery is fully charged. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE . Disconnect negative battery cable.
  2. Note location for fuel pressure gauge installation on fuel rail. See Fig 1. Fuel pressure gauge is installed at firewall end of fuel rail, between fuel rail and fuel inlet pipe. Cover union bolt at fuel rail with shop towel. Remove union bolt with gaskets, and disconnect fuel inlet pipe from fuel rail.
  3. Install fuel pressure gauge from Fuel Pressure Gauge Set (SST 09268-45014) with gaskets, fuel inlet pipe and union bolt on fuel rail. See Fig 1. Tighten union bolt to 21 ft. lbs. (29 N.m).
  4. Reinstall 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.
  5. 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 38-44 psi (2.7-3.1 kg/cm2 ).
  6. If fuel pressure is within specification, go to next step. If fuel pressure exceeds specification, replace fuel pressure regulator mounted on fuel rail. See FUEL PRESSURE REGULATOR under FUEL SYSTEMS in REMOVAL & INSTALLATION - 4-CYLINDER 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.
  7. Turn ignition off. Remove hand-held tester. Start engine and allow engine to idle. Note fuel pressure with engine idling.
  8. Check vacuum hose routing for fuel pressure regulator mounted on fuel rail to determine if fuel pressure regulator is vacuum controlled. If vacuum hose is connected to engine vacuum and not vented to the air cleaner assembly, fuel pressure regulator is vacuum controlled. If vacuum hose is vented to air cleaner assembly and not to engine vacuum, fuel pressure regulator is not vacuum controlled. On models with vacuum controlled fuel pressure regulator, fuel pressure should be 31-37 psi (2.2-2.6 kg/cm2 ) with engine idling and vacuum applied, and 38-44 (2.7-3.1 psi 2.7-3.1 kg/cm2 ) without vacuum with engine idling. On models without vacuum controlled fuel pressure regulator, fuel pressure should be 38-44 psi (2.7-3.1 kg/cm2 ) with engine idling. On all models, if fuel pressure is within specification, go to next step. If fuel pressure is not within specification, check for defective vacuum hose (vacuum controlled fuel pressure regulator) 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 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 fuel pressure gauge. Using NEW gaskets, reinstall fuel inlet pipe on fuel rail. Tighten union bolt to 21 ft. lbs. (29 N.m). 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: Installing Fuel Pressure Gauge (Tacoma)
    G98G01620Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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