I got my '65 about four months ago and it has the original gas tank in the cab.
I put a clear inline gas filter just past the fuel filter. I undoubtedly have rust in my tank.
Can anything be done with this or am I gonna have to go with a tank underneath.?
If so where do you get 'em?

 

You may want to replace it, I have seen them listed in LMC or NPD, or you my want to go to a wrecking yard. I have seen at some car shows of shops that can clean and coat fuel tanks, you my check in your area for some one who does this.

 

Thanks! I'll pay more attention at the next car show for someone that might be able to recondition my tank.

 

Before you go and replace the tank, there is a few things that you can do. 1. you can unbolt the tank, and have it sent to a sandblasting shop. Any machine shop will have this equipment and should only cost about 30 bucks. 2. Depending on how bad the rust is, I did a restoration two years ago on a rusty gas tank using a rust inhibitor product.
I was working at Ace Hardware and we got in a new type of liquid rust killer/ inhibitor. It is called- "The Must For Rust" You can find it at most Ace stores. What you do is get 2 containers or it. Remove your tank, and place it in a warm dry place. Let all fuel drain and evaporate. You have to rig a brush, much like a drain snake using a round wire brush with a long handle. Using something somewhat flexible is good. Brush away any visible rust using a flash light, the brush to look into the tank and see the rust. If you cannot see well enough you can drop in a haloween glow stick. Nobody i have seen uses that trick. I call it Scottis enginuity.
After you have removed the surface rust, plug the feed port at the bottom of tthe tank with a cap. Then using the rust inhibitor, empty the contents into the tank. Then get a friend and cap the filler spout with a cap and tape. have your friend pick up on side and you the other and start rotating the tank, long sides spinning. Do this for 10 minutes to allow total coverage of the tank. Check for leaks and repair. Then take a tire crayon and mark left, right, top, bottom, left side, right side. Start the curing by laying the tank on one side at a time for twenty minutes each. When finished you will be draining the tank of all it's contents. Make sure that you are in a well ventilated area and have a fire extinguisher around. To finalize the restoration, you will need to flush the tank by re plugging the bottom port. Pour in 1/2 gallon of high octane fuel into the tank. you use high octane because low octanes like Beacon and such have impurities in it and will re infect the defensless metal's of the tanks interior. I used jet fuel with gasoline, because im not all there in the head. Too many times of not using a respirator. Ha ha. Just kidding. No I'm serious. Anyways after you pour in your fuel. Carefully slosh the tank to rinse the linings of the tank. Do this for a couple minutes. Drain fuel into gas container. If you want to use this fuel you can always drain the fuel into a coffee filter and use it as lawnmower gas. If you wish. When complete with these steps. You are finished. Dispose of all pertoleum covered material properly, and if you get any on you remember to was your clothes by hand before using your maching machine because in the dryer, the fuel reminants will cause spontaneous combustion. Re install your tank after it had dried out for a day and was in a place where there was no moisture. (Very Important)-House is not a drying facility, unless you want brain damage or fire. After drying out the tank and reinstalling it, run higher octane than usual. Chevron is the best fuel for carbuerated Fords because the Techron is like honey to a bee, Fords love it, and the distillates in the fuel will build up a pertoleum based skin in the tank to replace the one that you lost due to rust.
Well if you do this you will have your tank back to it's better than original state. The total material cost is about 22.00 for the rust inhibitor, and 2.25 for the fuel. It will probably take you a total time of abot 1-2 days. Have fun and use caution. Remember to work in a well ventilated area with a respirator if needed.

 

Oh and remeber to use a cheap filter for a tankful. Run the fuel completely out, and then discard the filter and replace with a good one. Refill too. God Speed Brother in Ford Arms.

 

Beam me up Scotty! Thanks for your very informative and entertaining reply. I really don't want to replace my tank so I will take any and all suggestions.

Thanks again!