FYI FORD - MustangSteve's Ford Mustang Forum
The Internet's Most Knowledgeable Classic Mustang Information
IF YOU HAVE A QUESTION ABOUT CLASSIC FORD MUSTANGS, YOU HAVE COME TO THE RIGHT PLACE!
MustangSteve has over 30 years of Mustang experience, having owned 30 of them and restored several others. With the help of other Mustangers, this site is dedicated to helping anyone wanting to restore or modify their Mustang.... THERE ARE NO DUMB QUESTIONS!!!!!
Visit MustangSteve's web site to view some of my work and find details for:
FYIFORD Contributors' PICTURES - Power Brake Retrofit Kits for 65-66 Stangs - Classic Mustang FAQ's by MustangSteve - How to wire in a Duraspark Ignition - Mustang Ride Height Pictures and Descriptions - Steel Bushings to fit Granada Spindles to Mustang Tie Rods - Visit my EBAY store MustangSteve Performance - How to Install Granada Disc Brakes MustangSteve's Disc Brake Swap Page - FYIFORD Acronyms for guide to all the acronyms used on this page - FYIFORD Important information and upcoming events

You are not logged in. Would you like to login or register?

  • Index
  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » Gas tank to trunk seal?

    • 1 of 1

       

    2/07/2023 9:29 AM  #1

    DC
    Senior 24-7 FYI Addict

    Offline

    From: Marshall, MI
    Registered: 4/01/2013
    Posts: 1,249

    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
    Senior 24-7 FYI Addict

    Offline

    From: Houston, Texas
    Registered: 4/01/2013
    Posts: 2,012

    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
    Senior 24-7 FYI Addict

    Offline

    From: Montrose, Colorado
    Registered: 4/01/2013
    Posts: 4,885

    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
    Senior 24-7 FYI Addict

    Offline

    From: White Plains, NY
    Registered: 4/04/2013
    Posts: 2,636

    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
    Senior 24-7 FYI Addict

    Offline

    From: Bakersfield, Ca
    Registered: 9/17/2013
    Posts: 3,645

    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

    Offline

    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,243

    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
    Senior 24-7 FYI Addict

    Offline

    From: Marshall, MI
    Registered: 4/01/2013
    Posts: 1,249

    Re: Gas tank to trunk seal?

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

       •Thread Starter
     

     

    1 of 1

  • Index
  •  » FYI Ford, Classic Mustang Tech Discussion
  •  »  Gas tank to trunk seal?

    • Board footera


    REMEMBER!!! When posting a question about your Mustang or other Ford on this forum, BE SURE to tell us what it is, what year, engine, etc so we have enough information to go on.