Fuel System (For Sedan) Precaution

Before working on the fuel system, disconnect the cable from the negative battery terminal.

Do not work on the fuel system near any naked flames. Never smoke during the work.

Keep rubber and leather parts away from gasoline.

Remove the rear seat cushion (YARIS_NCP93 RM0000026GD00WX_01_0003.html).

Remove the rear floor service hole cover.

Disconnect the connector from the fuel pump assembly.

Start the engine. After the engine stops naturally, turn the ignition switch OFF.

HINT:

DTC P0171 may be set.

Crank the engine again and make sure that the engine does not start.

Remove the fuel tank cap and discharge the pressure.

Disconnect the cable from the negative battery terminal.

Connect the connector of the fuel pump assembly.

When disconnecting the high-pressure fuel line, a large amount of gasoline will splash. So take the following precautions.

1. Discharge the fuel system pressure.
   

2. Disconnect the fuel tube.
   





3. Drain the fuel remaining inside the fuel pump tube.
   

4. Cover the disconnected fuel tube connector and pipe with a vinyl bag to prevent damage and the intrusion of foreign matter.
   

Observe the following precautions when removing and installing the fuel injector.

1. Do not reuse the O-ring.
   

2. When placing a new O-ring onto the injector, do not damage the O-ring.
   

3. Coat the new O-ring with grease or gasoline before installing it. Do not use engine, gear or brake oil.
   

Install the injector into the delivery pipe and cylinder head, as shown in the illustration. Apply grease or gasoline oil to the contact surfaces of the delivery pipe and injector before installing the injector.

Observe these precautions when disconnecting the fuel tube connector.

1. Remove the fuel pipe clamp No.1.
   

2. Check whether there is any dirt in the pipe around the connector before disconnecting it and remove the dirt as necessary.
   





3. If the connector and pipe are stuck, pinch the retainer with your hand, then push and pull the connector to disconnect them. Do not use any tools.
   

4. Check the sealing surface of the pipe for dirt and mud. If dirty, wipe it with a shop rag or piece of cloth.
   





5. Cover the disconnected fuel tube connector and pipe with a vinyl bag to prevent damage and the intrusion of foreign matter.
   

Observe the following precautions when connecting the fuel tube connector.

1. Check that there is no damage or foreign matter on the part of the pipe that comes into contact with the connector.
   

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 too tight, apply a small amount of fresh engine oil to the tip of the pipe.
   





3. After connecting the pipe and connector, try to pull them apart to confirm that they are securely connected.
   

4. Attach the lock claws to the connector by pushing down on the cover.
   

Check that there is no fuel leakage after performing maintenance anywhere on the fuel system (YARIS_NCP93 RM000001EF100YX_01_0001.html).