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Tubes off the fuel guage sender 200 1990

posted by  EdM. on  Sun Oct 16 08:33 CST 2005
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last visit: Mon Apr 21 17:57 CST 2014
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I'm confused (so what else is new?). I'm about to do my fuel guage sender. There are three tubes running through the plate. There is the long, gently curved tube with the beveled end that is the return from the fuel rail. There is the shorter, striaght tube with the wide mouth that is the outlet from the in-tank pump. Then, there is a very short tube which only extends about an inch into the tank. It has a flanged to end to accept a hose. As the part is currently in the car, there is nothing hooked up to it. I can find no reference in Bentley to what should be hooked up to it. I can't figure out why there would be a vent.

So, what gives?

-EdM.
--
'90 240DL Wagon 'Lola' -- '72 1800ES 'Galadriel'








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    Tank connections 200 1990

    uid 27's pic
    posted by  Art Benstein on  Sun Oct 16 09:26 CST 2005
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    last visit: Fri Oct 17 20:10 CST 2014
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    Hi Ed,

    Not sure for all years, but earlier applications used this pipe to vent the fuel accumulator (k-jet) and many later models just capped this pipe. I think, in your 1990 car it should be capped. Here in this picture you can see the rust stops just short of where the cap used to be fitted on the far pipe.


    --
    Art Benstein near Baltimore








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      Tank connections 200 1990

      posted by  EdM. on  Mon Oct 17 05:36 CST 2005
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      last visit: Mon Apr 21 17:57 CST 2014
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      A parts and service guy at a Volvo dealer just told me it ought to go to a charcoal canister. I doubt his take on it, but he raises a certain point: the system has to vent somewhere, right? So, two questions:

      1. If the system has to vent somewhere, where does it vent?

      2. If the system does vent somewhere, how does the tank pressurize?

      You may note that my understanding of that end of the fuel system is not the greatest.

      -EdM.
      --
      '90 240DL Wagon 'Lola' -- '72 1800ES 'Galadriel'








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        Tank connections 200 1990

        posted by  EdM. on  Mon Oct 17 06:10 CST 2005
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        last visit: Mon Apr 21 17:57 CST 2014
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        Never mind. I figured out the evaporative emissions system, and (of course) the guy at the dealership was somewhat full of it. The line to the charcoal canister comes off the fuel filler.

        Still, I can't find a suitable part to cap the spare tube. It's been suggested that I use a vacuum cap, but I worry about fuel exposure. Another suggestion was to take a piece of fuel line and plug it with a bolt. I may end up doing that if I can't salvage what's on the car currently, but it sounds just a mite cheesy to me. There must be an original part out there for this application.

        -EdM.
        --
        '90 240DL Wagon 'Lola' -- '72 1800ES 'Galadriel'








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          Tank connections 200 1990

          uid 18083's pic
          posted by  lucid on  Mon Oct 17 07:34 CST 2005
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          last visit: Fri Oct 24 12:31 CST 2014
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          They are usually a plain rubber cap. The parts store should have an assortment of 6 or 8 sizes on a small plastic "tree" for a couple of bucks.

          There used to be a vent tube off that elbow. Now it gets capped. Sender design stayed the same.
          --
          Bruce Young
          '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.







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