Is there a mat or cushion between the fuel tank and body?

Fuel and Air Systems

  1. my68barracuda

    my68barracuda Well-Known Member

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    A few years ago I replaced the OE fuel tank in the 68 Barracuda with a new tank from Tanks Inc. Over the next few days I am going to be working around the fuel tank to improve the accuracy of the fuel level sender and I was wondering, per the title of this post. Does the topside of the tank fit firm against the underbody, or was there a mat between the two?
    I have a vague memory of having something between the tank and body, but not sure.
    And if there was something between the tank and body, what was the mat made of, source for a new one? Any issues if I just leave it out? Or should I loosen the straps and move the tank down enough to slide something in there?
    thanks
     
  2. DesertRat

    DesertRat Well-Known Member

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    Yes there is a separator between the two.
     
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    • cudascott

      cudascott It’s a sickness!

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      It was a mat very similar to roofing tar paper
       
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      • Daves69

        Daves69 Well-Known Member

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        • RustyRatRod

          RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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          I removed the original untouched tank out of Vixen when I first got her to inspect and clean it. There was nothing on top of it.
           
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          • cudascott

            cudascott It’s a sickness!

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            I removed the tank from my 67’ fastback that was all original and it had felt paper.
             
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            • my68barracuda

              my68barracuda Well-Known Member

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              thanks for the responses, very helpful
               
            • 694spd

              694spd Well-Known Member

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              Original one from my 69 Dart

              100_3084.JPG
               
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              • seabee

                seabee FABO Gold Member FABO Gold Member

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                I used a cut up yoga mat.
                 
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                • Dana67Dart

                  Dana67Dart The parts you don't add don't cause you no trouble FABO Gold Member

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                  This is my 67 dart tank.

                  Very much like 694spd showed

                  PXL_20210711_172025837.jpg
                   
                • rustycowll69

                  rustycowll69 Well-Known Member

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                  You do NOT want anything like an absorbent foam rubber between tank and underbody. My 76 power wagon had absorbent foam rubber between tank and cab. It held moisture against the steel fuel tank and the cab and rusted pin holes beneath the foam rubber.
                  I suggest using 30# roofing felt between tank and underbody.
                  I've parted out many dozens of a-bodies years ago. All of them had what looked like roofing felt in there.
                   
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                  • S'cuder

                    S'cuder FABO Gold Member FABO Gold Member

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                    I heard that the mat that was in some cars had a high asbestos content, and that's why accurate reproductions can't be had.
                    Pity the poor guy who loses sleep over that.
                     
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                    • seabee

                      seabee FABO Gold Member FABO Gold Member

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                      Yoga mats (at least the cheap ones) are polyvinyl chloride (PVC) and are non porous (closed cell structure) and a non absorbent material.
                       
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                      • halfafish

                        halfafish Damn those rabbits, and their holes! FABO Gold Member

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                        I have the mat that was from the factory for my 69 Dart. As mentioned above, it feels like roofing felt. If you need a template let me know, I can trace one for you.
                         
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                        • Ironracer

                          Ironracer Gearhead

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                          Looks like the one I pulled outta my 74 Duster last year.
                           
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                          • dartfreak75

                            dartfreak75 Restore it, Dont part it! FABO Gold Member

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                            Unfortunately I don't have a picture of the mat but you can most definitely see where it was at on this picture. I did reinstall it after I painted the gas tank.

                            Screenshot_20211023-023114_Gallery.jpg

                            Screenshot_20211023-023254_Gallery.jpg
                             
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                            • Ironracer

                              Ironracer Gearhead

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                              Ended getting the less expensive one Detroit offered ( not a resto part). . As a Carpenter, I know tar paper won't permit moisture intrusion, but it WILL trap moisture. That's why we use Tyvek (or equivalent) it's waterproof, but let's things breath. And I just don't want my darn gas tank rubbing metal up top.....
                               
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                              • Ironracer

                                Ironracer Gearhead

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                                Wow! Looks Great!
                                 
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                                • dartfreak75

                                  dartfreak75 Restore it, Dont part it! FABO Gold Member

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                                  Just cheap silver rustoleum like the rest of the car lol
                                   
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                                  • CRUZE 418

                                    CRUZE 418 FABO Gold Member FABO Gold Member

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                                    Mega Parts or Vans carry the mat.
                                     
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