Gas tank question

1968 -1970 Mopars

  1. pearljam724

    pearljam724 Well-Known Member

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    Where do the 2 vent lines on an original tank route to ? I can see they go up through the trunk floor from underneath. But, where do the hoses come out at or end ?
     
  2. moparnation74

    moparnation74 FBBO Gold Member FBBO Gold Member

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    • dadsbee

      dadsbee FBBO Gold Member FBBO Gold Member

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      Please take the time to read some restoration threads. The tank line that goes all the way to the filler neck end of the tank connects to the upper shock area bulkhead line. The vent line that is just inside the forward end of the tank connects to the line that goes up into the trunk and then back down into the passenger frame rail. Shine a light in the tank to see which is which.. as some OE and repro tanks swap which line is which..
       
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      • pearljam724

        pearljam724 Well-Known Member

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        If I run a return line from a fuel filter back to the tank vent lines. It shouldn’t matter which vent barb I choose, right ? Is one better to use than the othe for a return line ? My tank filler neck doesn’t have a vent hose attached.
         
      • dadsbee

        dadsbee FBBO Gold Member FBBO Gold Member

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        That is not what they are for, if you have a full tank and have tee'd into a vent line you may just pump that return overboard and not into the tank!
         
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        • pearljam724

          pearljam724 Well-Known Member

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          I understand they are not intended for that. I’ve read many places that people run a return line to the tank from a wix fuel filter that has a return nipple attached to the filter to help against vapor lock. You couldn’t use 1 vent on tank as a return line, being you would have one more on tank remaining to vent tank ? I wouldn’t be teeing off the main fuel line, the wix filters have a designed return nipple on them. My idea won’t work ?
           
        • dadsbee

          dadsbee FBBO Gold Member FBBO Gold Member

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          If you want to temp that, use the vent fitting that goes to the upper shock mount bulkhead.
           
        • pearljam724

          pearljam724 Well-Known Member

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          Thank you, my thinking was. I could run a rubber line and if it creates a problem I could quickly and easily remove it. I could be wrong, but if the tank only had 1 vent, then I could definitely see that as a problem. That’s what these particular Wix filters were designed to do. To return fuel to the tank to aid against vapor lock. Some different manufacturer models had them installed from the factories. I think the correct description of this filter is a vapor separator. I believe it returns vapors to tank, rather than actually fuel. https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/382981324826
           
          Last edited: Nov 4, 2019
        • Bill Monk

          Bill Monk FBBO Gold Member FBBO Gold Member

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          The only correct way to have a return line is to use a sending unit that has the return nipple
           
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          • pearljam724

            pearljam724 Well-Known Member

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            Ok, thank you. Does anyone make one for a B Body tank ?
             
          • Bill Monk

            Bill Monk FBBO Gold Member FBBO Gold Member

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            They are available, I have a brand new one. 3/8 line with a 1/4 return. It's one of the chinese deals though so I can't tell you anything about the accuracy of it, I never tested it. If you want it, I'll sell it to you for $35 and I'll pay the shipping on it. PM me if interested
             
          • pearljam724

            pearljam724 Well-Known Member

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            I ll take it. Sent you private message
             
          • cosgig

            cosgig Well-Known Member

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            The sending unit Vans sells for the 70 tank has the return line built into it.
             
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