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Fuel Pressure

NOTE: Vehicles use in-tank fuel pump.
  1. Ensure battery is fully charged and ignition is off. Disconnect negative battery cable.
  2. Note location for fuel pressure gauge installation. See Fig 1. Remove necessary components for access to fuel filter. Place container under fuel filter. Cover union bolt with shop towel. Slowly loosen union bolt to release fuel pressure.
  3. Remove union bolt and gaskets. Install Fuel Pressure Gauge (SST 09268-45012) using NEW gaskets. See Fig 1. Tighten union bolt to 21 ft. lbs. (29 N.m). Reconnect negative battery cable.
  4. Install scan tool on data link connector No. 3. See Figure. Turn ignition on. DO NOT  start engine.
  5. 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 within specification. See FUEL PUMP PERFORMANCE  table.
    NOTE: Fuel pump may also be activated by connecting battery voltage to specified terminals on fuel pump. See Figure.
  6. If fuel pressure exceeds specification, replace fuel pressure regulator. Fuel pressure regulator is located on fuel pump assembly in the fuel tank. If fuel pressure is less than specified, check for defective fuel lines, connections, fuel pump, fuel filter or fuel pressure regulator.
  7. Turn ignition off. Remove scan tool from data link connector No. 3. Start engine and allow engine to idle. Note fuel pressure with engine idling. Fuel pressure should be within specification. See REGULATED FUEL PRESSURE  table.
  8. Shut engine off and note fuel pressure. Fuel pressure should hold at least 21 psi (1.5 kg/cm2 ) for a minimum of 5 minutes. If fuel pressure does not hold as specified, check for defective fuel pump, fuel injector or fuel pressure regulator.
  9. Disconnect negative battery cable. Remove fuel pressure gauge. Reinstall union bolt using NEW gaskets. Tighten union bolt to 21 ft. lbs. (29 N.m). Install negative battery cable. Recheck for fuel leaks. Reinstall necessary components.
Fig 1: Installing Fuel Pressure Gauge
G95F31612Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NOTE: For more information on checking fuel injectors and other fuel sub-systems, see SYSTEM/COMPONENT TESTS article.
FUEL PUMP PERFORMANCE

Application Pressure psi (kg/cm2 )
Avalon (1) 44-50 (3.1-3.5)
(1) Check fuel pressure with engine off and using scan tool connected to data link connector No. 3 with ignition on to activate fuel pump or by connecting battery voltage to terminals on electric fuel pump.
REGULATED FUEL PRESSURE

Application Tested At Idle W/Vacuum psi (kg/cm2 ) At Idle W/O Vacuum psi (kg/cm2 )
Avalon (1) (1)*
(1) Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm2 ) with engine idling. Fuel pressure regulator is not vacuum controlled, as fuel pressure regulator is mounted on in-tank fuel pump.
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