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Tacoma, Tundra 3.4L V6 & 4Runner

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  1. Ensure battery is fully charged. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE .
  2. Disconnect negative battery cable. Remove bolts, upper timing belt cover and gasket for access to fuel pipe at front of driver's side fuel rail for installation of fuel pressure gauge. See Fig 1. Cover union bolt on fuel pipe at front of driver's side fuel rail with shop towel. Remove union bolt with gaskets, and disconnect fuel pipe from front of driver's side fuel rail.
  3. Install gaskets, union, union bolt and fuel pressure gauge from Fuel Pressure Gauge Set (SST 09268-45014) with fuel pipe on driver's side fuel rail. See Fig 1. Tighten union bolt to 25 ft. lbs. (34 N.m).
  4. Install negative battery cable. Connect Toyota hand-held tester to data link connector No. 3 at driver's side of instrument panel. See Figure-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. On Tacoma and 4Runner, 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. On all models, 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 at firewall end of driver's side fuel rail. See FUEL PRESSURE REGULATOR under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 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 from data link connector No. 3. Reinstall No. 2 timing belt cover. Tighten bolts to 80 INCH lbs. (9.0 N.m). Start engine and allow engine to idle. Note fuel pressure with engine idling.
  8. Check vacuum hose routing for fuel pressure regulator mounted at firewall end of driver's side 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 33-38 psi (2.3-2.7 kg/cm2 ) with engine idling and vacuum applied, and 38-44 (2.7-3.1 psi 2.7-3.1 kg/cm2 ) with engine idling without vacuum applied. 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 upper timing belt cover. Remove union bolt, union and fuel pressure gauge from driver's side fuel rail. Using NEW gaskets, install fuel pipe on driver's side fuel rail. Tighten union bolt to 25 ft. lbs. (34 N.m). Reinstall upper timing belt cover. Tighten bolts to 80 INCH lbs. (9.0 N.m).
  11. Install negative battery cable. Check for fuel leaks by activating the fuel pump by using hand-held tester. On Tacoma and 4Runner, fuel pump may also be activated by connecting battery voltage to specified terminals on fuel pump to check for fuel leaks. See Figure.
Fig 1: Installing Fuel Pressure Gauge (Tacoma, Tundra 3.4L V6 & 4Runner)
G98D11240Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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