1UR-FE ENGINE


  1. General


    1. The fuel pump is stopped when the Supplemental Restraint System (SRS) airbags are deployed.

    2. Compact 12-hole type fuel injectors are used to improve the atomization of fuel.

    3. Fuel delivery pipe sub-assemblies formed from stamped steel are used to deliver fuel to the fuel injectors.

    4. Quick connectors are used to connect the fuel lines for ease of serviceability.

    5. The dual fuel tank which is comprised of a fuel tank and a fuel sub tank is provided.*


      • *: Models with dual fuel tank

    6. A multi-layer plastic fuel tank is used.

    7. A multi-layer plastic fuel sub tank is used.*


      • *: Models with dual fuel tank

      A01W5U3C01
      *1 Fuel Delivery Pipe Sub-assembly *2 Fuel Injector Assembly
      *3 Quick Connector *4 Fuel Filter
      *5 Fuel Tank *6 Fuel Sub Tank
      *7

      Fuel Pump Assembly


      • Fuel Pump

      • Fuel Sender Gauge

      • Jet Pump

      		 *8 Charcoal Canister
      *a Bottom Side View *b Fuel Injector Assembly Cross Section

  2. Delivery Pipe


    1. Fuel delivery pipe sub-assemblies formed from stamped steel are used to deliver fuel to the fuel injector assemblies.

    2. A fuel pressure pulsation damper assembly is provided on the fuel delivery pipe sub-assembly in the left bank. A fuel pressure regulator assembly is installed on the right bank fuel delivery pipe sub-assembly.

    3. The wiring harnesses that connect to the fuel injector assemblies are combined into a single strand at each bank. Furthermore, they each connect to the engine harness at a single connector for improved serviceability.

      A01W6ZCC01
      *1 Fuel Pressure Regulator Assembly *2 Fuel Delivery Pipe Sub-assembly
      *3 Fuel Injector Assembly *4 Fuel Pressure Pulsation Damper Assembly
      *5 Wiring Harness - -

  3. Fuel Tank


    1. General


      1. The multi-layer plastic fuel tank consists of 6 layers of 4 types of materials, and one of those is a recyclable material to address environmental concerns.

      2. A jet pump, which automatically transfers fuel from the fuel sub tank to the fuel tank, is provided in the fuel tank on models with a dual fuel tank.

        Figure 1. Cross Section of Fuel Tank

        A01W6MFC01
        *1 High Density Polyethylene *2 Recyclable Material
        *3 Adhesive *4 Ethylene Vinyl Alcohol Copolymer
        *a Fuel Tank Outside *b Fuel Tank Inside

        Tech Tips

        A drain mark has been provided at the lowest position of the fuel tank. When dismantling (scraping) the vehicle, drain fuel by drilling holes at the drain mark.

        A01W6TUC01
        *a Drain Mark *b View from Bottom Side

    2. Construction of Dual Fuel Tank


      1. General


        • A jet pump is provided in the fuel tank in order to automatically transfer fuel from the fuel sub tank to the fuel tank.

        • A fuel filler pipe which has a unified structure directly below the fuel inlet but which branches into two at a midway point in used. Therefore, the driver can refuel without the need to distinguish the fuel tank from the fuel sub tank.

          Figure 2. System Diagram

          A01W6TTC01
          *1 Return Tube *2 Engine
          *3 Main Tube *4 Fuel Pump
          *5 Fuel Tank *6 Jet Pump
          *7 Fuel Sub Tank *8 Fuel Filler Pipe
          *9 Fuel Inlet - -

      2. Fuel Inlet


        • There is only one fuel filler pipe directly below the fuel inlet, which branches into two pipes at a midway point.

          A01W6OQC01
          *1 Fuel Supply Nozzle *2 Fuel Inlet
          *3 Fuel Filler Pipe - -
          *a To Sub Fuel Tank *b To Main Fuel Tank

      3. Operation


        • The fuel from the fuel pump actuates the jet pump in the fuel tank, in order to draw fuel from the fuel sub tank to the fuel tank.

          A01W5UPC01
          *1 Return Tube *2 Engine
          *3 Main Tube *4 Fuel Pump
          *5 Fuel Tank *6 Jet Pump
          *7 Fuel Sub Tank - -

        • The fuel from the fuel pump passes through the orifice in the jet pump and returns to the fuel tank. Because the flow speed of the fuel from the fuel pump increases as it passes through the orifice, a vacuum is created near the exit of the orifice. This vacuum causes the fuel to be drawn from the fuel sub tank to the fuel tank.

          A01W6BEC01
          *1 Jet Pump - -
          *a From Fuel Sub Tank *b From Fuel Pump
          *c To Fuel Tank *d Orifice