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  •  » Gas tank to trunk seal?

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    2/07/2023 9:29 AM  #1

    DC
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    From: Marshall, MI
    Registered: 4/01/2013
    Posts: 1,235

    Gas tank to trunk seal?

    Gotta have new gas tank so what do I use to seal the tank flange to trunk floor on my 65 FB? New tank fits good. Grand son removed old one so I do not know what was in there.

     

    2/07/2023 9:44 AM  #2

    Bolted to Floor
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    From: Houston, Texas
    Registered: 4/01/2013
    Posts: 1,918

    Re: Gas tank to trunk seal?

    I used 3M strip caulk from O’rielly auto parts.

    John  -- 67 Mustang Coupe 390 5 speed
     

    2/07/2023 10:38 AM  #3

    Bullet Bob
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    From: Montrose, Colorado
    Registered: 4/01/2013
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    Re: Gas tank to trunk seal?

    I have used seam seal but the last time, 2014, I used the 3M caulk strips. 

    "you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
     

    2/07/2023 3:56 PM  #4

    BobE
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    From: White Plains, NY
    Registered: 4/04/2013
    Posts: 2,196

    Re: Gas tank to trunk seal?

    I’d use the 3M caulk strips, of a RTV product.
    The 64-66 Mustang “Body Assembly Manual” offers two sealing methods. 
    First -  prior to tank installation; apply a ¼” bead of sealer around the perimeter of the opening.
    Second – pour, and spread with a brush, seal sealer over the joint of the floor pan and fuel tank, covering the attaching screws.
    For me, I’d use the first method.

    65 Fastback, 351W, 5-speed, 4 wheel discs, 9" rear,  R&C Front End.
     

    2/07/2023 5:05 PM  #5

    RPM, aka Bearing Bob
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    From: Bakersfield, Ca
    Registered: 9/17/2013
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    Re: Gas tank to trunk seal?

    Bolted to Floor wrote:

    I used 3M strip caulk from O’rielly auto parts.

     
    Yep, I used this two.

    Bob. 69 Mach 1, 393W, SMOD Toploader, Armstrong  steering, factory AC.
     

    2/07/2023 8:37 PM  #6

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 11,729

    Re: Gas tank to trunk seal?

    Strip caulk. You might not believe this, but I would NOT recommend RTV on this joint.  If you did it properly, you would likely never get that tank back out.

    A non-hardening rope sealer works quite well. I would attempt to make a 100% seal, though to avoid having moisture get in the joint and cause corrosion.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    2/14/2023 8:29 AM  #7

    DC
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    From: Marshall, MI
    Registered: 4/01/2013
    Posts: 1,235

    Re: Gas tank to trunk seal?

    I'll get some strip caulk and make it a done deal, thanks for the info!!

       •Thread Starter
     

     

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