Toyota Tundra Service Manual: Precaution

PRECAUTION

CAUTION:

• Before working on the fuel system, disconnect the cable from the negative (-) battery terminal.
• Do not smoke or be near an open flame when working on the fuel system.
• Keep gasoline away from rubber and leather parts.

NOTICE:

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (See page ).

1. DISCHARGE FUEL SYSTEM PRESSURE

CAUTION:

• Do not disconnect any part of the fuel system until you have discharged the fuel system pressure.
• After discharging the fuel pressure, place a cloth or equivalent over fittings as you separate them to reduce the risk of fuel spray on yourself or in the engine compartment.

(a) Disconnect the cable from the negative (-) battery terminal.

(b) Disconnect the fuel pump ECU connector (See page ).

(c) Connect the cable to the negative (-) battery terminal.

(d) Start the engine. After the engine has stopped on its own, turn the ignition switch off.

HINT:

DTC P0171/0174 (system too lean) may be set.

(e) Crank the engine again, and then check that the engine does not start.

(f) Loosen the fuel tank cap, and then discharge the pressure in the fuel tank completely.

(g) Connect the fuel pump ECU connector (See page ).

2. FUEL SYSTEM

(a) When disconnecting the high fuel pressure line, a large amount of gasoline will spill out. Follow these procedures.

(1) Perform the "DISCHARGE FUEL SYSTEM PRESSURE" procedures above.

(2) Put a container under the connecting part of the pressure line.

(3) Slowly loosen the connection.

(4) Disconnect the connection.

(5) Plug the connection with a rubber plug.

(b) Observe these precautions when removing and installing the fuel injectors:

• Never reuse the O-ring.
• When placing a new O-ring on the fuel injector assembly, do not damage it.
• Coat a new O-ring with spindle oil or gasoline before installing it. Do not use engine oil, gear oil or brake oil.

(c) Install the fuel injector assembly to the fuel delivery pipe sub-assembly and intake manifold as shown in the illustration.

NOTICE:

Before installing the fuel injector assembly, apply spindle oil or gasoline on the place where the fuel delivery pipe contacts the O-ring of the fuel injector assembly.

(d) Observe these precautions when disconnecting the fuel tube connector (for Quick Type A).

(1) for Fuel Hose Connector Cover Type:

Detach the lock claw by lifting up the cover as shown in the illustration.

(2) for Fuel Pipe Clamp Type:

Remove the fuel pipe clamp from the fuel tube connector.

(3) Check for dirt or mud on the pipe and around the connector before disconnection. Clean if necessary.

(4) Pinch the connector and disconnect the connector and pipe.

If the connector and the pipe are stuck together, pinch the connector, push and pull the pipe to disconnect the pipe and pull it out.

NOTICE:

Do not use any tools.

(5) Check for dirt or mud on the seal surface of the disconnected pipe. Clean if necessary.

(6) To protect the disconnected pipe and connector from damage and contamination, cover it with a plastic bag.

(e) Observe these precautions when connecting the fuel tube connector (for Quick Type A).

(1) Check that there is no damage or contamination in the connected part of the pipe.

(2) Align the axis of the connector with the axis of the pipe. Push the pipe into the connector until the connector makes a "click" sound. If the connection is tight, apply a small amount of fresh spindle oil or gasoline on the tip of the pipe.

(3) After having finished the connection, try to pull apart the pipe and the connector to confirm that they are securely connected.

(4) for Fuel Pipe Clamp Type:

Install the fuel pipe clamp to the connector.

(5) for Fuel Hose Connector Cover Type:

Attach the lock claw to the connector by pushing down on the cover as shown in the illustration.

(6) Check that there is no fuel leakage.

(f) Observe these precautions when disconnecting the fuel tube connector (for Quick Type B).

(1) Check that there is no damage or foreign matter on the part of the pipe that contacts the connector.

(2) Spread the tabs of the retainer outward and pull the retainer upwards to disconnect the connector from the pipe.

HINT:

• The connector can also be disconnected from the pipe by inserting a screwdriver with a blade of 4 mm or less into the service hole in the back of the retainer and pulling the retainer upwards.
• If the connector and pipe are stuck, pinch the fuel pipe by hand and push and pull the connector to disconnect it.

(3) Check for foreign matter on the seal surface of the disconnected pipe. Clean if necessary.

(4) To protect the disconnected pipe and connector from damage and foreign matter, cover them with a plastic bag.

(g) Observe these precautions when connecting the fuel tube connector (for Quick Type B).

(1) Check for foreign matter on the pipe and around the connector before connecting it. Clean if necessary.

(2) Align the axis of the connector with the axis of the pipe. Push the connector onto the pipe, and then push in the retainer until a "click" sound is heard.

NOTICE:

• Before connecting the tube connectors to the pipes, check if there is any damage or foreign matter in the connectors.
• After connecting the pipe and connector, check that the pipe and connector are securely connected by trying to pull them apart.

(3) Check that there is no fuel leakage.

3. CHECK FOR FUEL LEAK

(a) Check that there are no fuel leaks after performing maintenance anywhere on the fuel system (See page ).