Fuel Pressure

NOTE: All models use in-tank fuel pump. Fuel pump contains internal relief valve and check valve.

Ensure battery is fully charged and ignition is off. Disconnect negative battery cable. Disconnect electrical connector from cold start injector (if equipped). Place container under cold start injector pipe or deliver pipe.
Note location of fuel pressure gauge installation. See Fig 1-6. Cover union bolt with shop towel and slowly loosen union bolt to relieve fuel pressure. Remove union bolt and gaskets. Install Fuel Pressure Gauge (SST 09268-45012), using NEW gaskets. See Fig 1-6.
Tighten union bolt. Reconnect negative battery cable. Install jumper wire between +B and FP terminals of engine check connector. See Figure-3. Turn ignition on and note fuel pressure. Fuel pressure should be within specification. See FUEL PUMP PERFORMANCE table.
If fuel pressure is greater than specification, replace fuel pressure regulator. If fuel pressure is less than specification, check for defective fuel lines, connections, fuel pump, fuel filter or fuel pressure regulator.
Remove jumper wire from engine check connector. Start engine and allow to idle. Disconnect and plug vacuum line at fuel pressure regulator. Note fuel pressure.
Reconnect vacuum hose on fuel pressure regulator and note fuel pressure. Fuel pressure should be within specification. See FUEL PRESSURE SPECIFICATIONS table.
If fuel pressure is not within specification, check for defective vacuum hose or fuel pressure regulator. 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.
Disconnect negative battery cable. Remove fuel pressure gauge. Reinstall union bolt using NEW gaskets. Tighten union bolt. Install cold start injector electrical connector (if equipped). Install negative battery cable.

FUEL PUMP PERFORMANCE

Application

⁽¹⁾ Pressure psi (kg/cm² )

6-Cylinder

Cressida

38-44 (2.7-3.1)

Land Cruiser

37-46 (2.6-3.2)

Supra

Turbo

33-40 (2.3-2.8)

Non-Turbo

38-44 (2.7-3.1)

⁽¹⁾	Check fuel pressure with jumper wire installed between engine check connector terminals +B and FP, ignition on and engine off.

FUEL PRESSURE SPECIFICATIONS

Application Type Tested	At Idle W/Vacuum psi (kg/cm² )	At Idle W/O Vacuum psi (kg/cm² )
6-Cylinder
Cressida	33-37 (2.3-2.6)	38-44 (2.7-3.1)
Land Cruiser	33-37 (2.3-2.6)	37-46 (2.6-3.2)
Supra
Non-Turbo	30-37 (2.1-2.6)	38-44 (2.7-3.1)
Turbo	23-30 (1.6-2.1)	33-40 (2.3-2.8)

NOTE: For more information on checking fuel injectors and other fuel sub-systems, see I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section.

Fig 1: Installing Fuel Pressure Gauge (Cressida)

Fig 2: Installing Fuel Pressure Gauge (Land Cruiser)

Fig 3: Installing Fuel Pressure Gauge (Supra)