Do you have your truck down to the frame? I don't see any way the tank will come out without at least loosening the running board bracket enough to let the tank fall. At least that's what I did. Of course I still don't have mine all the way down. My brackets were bolted on with caged nuts, but since they were very rusted (only had WD40 - wish I know about the tranny fliud/acetone - I have both sitting around) they are not "caged" anymore. 3 of them broke.

Hi Glenn. Finally, the PB Blaster worked and I was able to remove one running board brace which allowed me to drop the tank. I ran some water through it and you would not believe all the trash that was in it! I think before I install the new tank, I will borrow my neighbor's portable compressor and shoot some air through the metal fuel lines for good measure. Hopefully the reinstallation on my new polypropholene (spelling) tank will give me years of worry free service.

I had mine down to the frame with running boards off.

I'm sure that made it pretty easy. In my previous post, I was leaning towards blowing air through the metal gas line but the more I think about it, maybe I would be better off replacing with new line..this way I will know that everything is clean. If I had that much trash in the tank, I have a feeling that the lines are probably pretty dirty as well. Besides, it looks like a pretty easy task.

I went with a new poly tank. I think I'm going to go ahead and get new lines. I have an electric pump mounted on the frame with a filter on both sides. After the prefilter clogged a couple of times, I bought the new tank. I have new running boards as well. I wonder how much 54 stuff my truck will have on it when I'm finished!

Hey guy's doing my tank right now..mine's rusted out..is there any supplier in canada

I got my tank at Mid-Fifties F100. The only difference is that it's a 15 gal vice 17 gal. I have decided to yank out the old line and will replace with some new brake line from my local parts store.

I got my tank at a show from Hot Rod's. I am assuming that everybody's buying these tanks from one manufacturer. They told me that the poly and metal tanks hold 17 gallons. My poly tank does have a hollow spot right in the middle I'm guessing for strength. Its not big enough to displace very much fuel. I have seen other's that advertise the poly tanks only hold 15.

I'm replacing my fuel tank, also a 55 f100, and found this thread. I'm adding a quick note for those that also find this thread and use it for reference.... and a question or two for those that may wish to correct/help me.

I'm wondering whether or not the folks that were able to remove their stock fuel tanks, after simply loosening the straps (without removing the running board supports), actually had the cab off the frame at the time?

I removed my tank this weekend and after looking and wiggling repeatedly, I determined that either (a) I'm not as smart as some of you or (b) you cannot remove your tank with both the cab and running board supports attached.

I simply had to remove the rear running board support to remove the tank.

So two questions:

Question 1: Is it (a) or (b) above?

Question 2: Pretty sure this was the first time since my truck rolled out of the factory that anyone touched my running board supports. The lower mounting bolts were super rusty. In spite of much penetrating oil, the threads were so clogged with rust that I ended up breaking the welds that hold the nuts mounted on the tank side of the support (had to grind the heads off to remove those bolts. Is anyone aware of attempts to re-weld new nuts to these, or do we just get some nuts and hope we can get a wrench up in there to tighten or loosen? I'm not a welder, but am considering looking for someone that can do the job. My only concern is that if it is not placed exactly right, I may end up with a bigger headache than non-welded nuts.

The rear running board bracket had to be removed when I took mine out with the cab in place.

While you have it apart replace the 60 year old gas line as well. Steel (no copper or aluminum) line from the tank to a screw on inline filter in front of the firewall, back to steel until across from the fuel pump then use a flexible fuel line from there to pump. Be sure to use hose specifically labeled for use with gasahol. Rust isn't as big a problem as gasahol which eats almost all rubber from the inside out (another reason to replace the line).

Thanks AXRacer. I must have stopped reading the notes indicating you just needed to loosen the straps... was anxious to get at it. Guess I should have reviewed the entire thread before assuming someone hadn't already clarified. Live and learn