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  • gas tank breather line

    Will a fuel filter serve as a fuel air separator in the gas tank breather line?

  • #2
    No. What year car do you have, most of them had one in the boot.
    72 Pimento w/overdrive - Lilred
    67 4A Royal Blue - Lilblue

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    • #3
      A quick glance at the Moss catalog shows the '70-'71 years have the "emission tank" in the right side of the boot in conjuncion with the 2 spigot carbon canister up front in the engine bay.
      CF1634U+O Pimento/Chestnut
      2nd owner, since 1975
      Now in Fair Oaks, CA

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      • #4
        Originally posted by TeaAre6 View Post
        Will a fuel filter serve as a fuel air separator in the gas tank breather line?
        The functions of a filter and a separator are pretty different. The separator prevents liquid fuel from passing through. The filter permits liquid fuel to pass through.

        Ed.
        For just a little more, you can do it yourself!

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        • #5
          Gasoline passes through the filter under pressure. I assume that if there is no pressure then the filter will prevent the small amounts from passing. The gas separator is no longer available.

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          • #6
            No, won’t work that way. A filter will pass both.

            PM Todd, TR250 - he probably has a used one he’ll sell.
            Last edited by lfmTR4; 01-21-2023, 03:53 PM.
            72 Pimento w/overdrive - Lilred
            67 4A Royal Blue - Lilblue

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            • #7
              You need something, even if it's homemade that has an inlet nipple lower than the outlet nipple...creating a place for settlement.
              Last edited by poolboy; 01-21-2023, 03:31 PM.
              Driving a 1973 TR6
              Doing ZS carb repairs
              email kencorsaw"at"aol.com

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              • #8
                I occasionally see the later style separator cannister, that was up by the filler neck, on eBay, if that could be fitted.

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                • #9
                  When it is cold then the air in the tank will occupy a smaller volume and there will be a 'vacuum'. When it is hot then there will be pressure in the tank which needs to be released. A filter will solve both problems. The question is whether the filter will prevent the fuel from passing under weak outgassing pressures. I think that I will set up a simple experiment to see if it will prevent gas from moving through.

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                  • #10
                    What you don't want is whatever you come up with to prevent air from entering the tank as the fuel level in the tank drops.
                    If the engine sputters and dies after filling the tank, you'll know why.
                    Driving a 1973 TR6
                    Doing ZS carb repairs
                    email kencorsaw"at"aol.com

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