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Emission system for 1970 - 1971 TR6

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  • Emission system for 1970 - 1971 TR6

    The emmision system for the 1970-1971 TR6 consisted of rubber hoses directing gases from the engine to the charcoal canister on the right side of the frame. From the fuel tank, you had a nylon tube run from the overflow on the cap area to a small tank mounted on the right side trunk floor and then out of that small tank around the trunk, down the frame on the left side and across the front cross member to the charcoal cannister tank. These are not sold now by the big three suppliers. Does anybody know what size nylon tubing it uses? I assume it was originally black and I'm sure I can get it at Home Depot or Lowes. I don't have any original available for my car to take with me to size it. Maybe somebody has that information somewhere?

  • #2
    It appears to be 5/16" od and 3/16" id and yes it is black.
    1970ish CC54713L
    HVDA Toyota 5spd
    Nissan Diff
    Miata Seats

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    • #3
      I also recommend that you use hose that is rated for fuel, PCV and EEC systems.

      Glenn
      1971 TR6
      HVDA Toyota 5spd
      Rick Patton fuel injection
      Advanced Auto wire Harness

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      • #4
        Thanks guys! Wasn't sure of the size since the one on my car wasn't on there when I got it.

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        • #5
          I trust you have the canister & unions (Ts) for the pipes
          So much rust, so little time

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          • #6
            That nylon “pipe” is a pain in the butt to work with. I think I had thrown mine out because I had planned to replace it with black polypropylene tubing. When I got around to needing it again I decided to go use the original material (nylon) for correctness sake. So I used it but I didn’t like it. Make sure you have a heat gun if you want to bend it.

            With regards to the carbon canister- it is there for the gas tank fumes. That’s it. The fumes desorb to the carbon. The tubing from the engine is not emissions rather it is a vacuum source to resort the gas fumes from the carbon and direct them into the carburetors to be burned in combustion. One detail that is often missed is that at the vacuum lines to the canister connections, there are little limiting orifices that often get stuck in the old tubing when you pull the tubing off. You need these to control the airflow and maintain the proper level of vacuum for the engine.

            If if you really want to use the nylon tubing, send me your address and you can take what
            you need from the coil for free. I am never going to use it all.

            John Cyg
            Last edited by Cygan; 08-12-2019, 05:43 PM.

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            • #7
              Originally posted by tr250 View Post
              I trust you have the canister & unions (Ts) for the pipes
              Yes I have the original canister that has cleaned up real good. Blasted the bracket and repainted it and she's ready to go. It's the one that has the two connection top, not the three for later models.

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              • #8
                No I mean the metal one in the boot
                So much rust, so little time

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                • #9
                  Yes TR250 I do have the metal one in the boot. It's got some rust, but was blasted but no apparent holes.

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                  Emission system for 1970 - 1971 TR6

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