Author Topic: Treating a Rusty Fuel Tank  (Read 223 times)

cobbadog

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Treating a Rusty Fuel Tank
« on: 05 September, 2019, 04:02:07 pm »
Well as you may know I have had a rust issue in both sides of the TVO fuel tank of our Cropmaster. So I researched the more common sealants to fix it and decided to go with an all Aussie made and sold product made by KBS. They do have a website and is worth a look and make all sorts of coatings for different situations. It you have not heard of them or know of the product it's main competitor is POR products. So hopefully this weekend I will make a start on treating both of the insides of the tank.
Cheers, John & Dee. Coopernook. NSW.

cobbadog

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Re: Treating a Rusty Fuel Tank
« Reply #1 on: 07 September, 2019, 03:49:29 pm »
First step was to remove the chains that connect the screw on fuel caps, block up the outlets underneath and then get some plastic to use under the fuel caps to seal them off.
I mixed up the Aqua Clean at 1:1 using hot water and poured a litre in the back tank and 3 into the main tank. Kept giving it a shake and rotate every now and then and after an hour I dropped the back tank, smallest, and not much came out. Then the main tank was dropped and boy was there a lot of crap come out the outlet. So much that it was blocking it up so with the use of wire I kept shaking the tank more and kept unblocking the outlet.
As you can see by the colour of the cleaner there was a mess inside but I also got a good 2 handfuls of loose rust out on the first treatment. I flushed the back tank out and it was ready for the next step apart from drying it out with a heat gun. The main tank I had to keep filling it up with rinse water and unblocking the hole for quite some time.
In one of the pics you can see the filler tube and at the bottom of it the bottom of the main tank and it is still a mess. So I have mixed the last of the cleaner and put inside the main tank to soak overnight.
Cheers, John & Dee. Coopernook. NSW.

cobbadog

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Re: Treating a Rusty Fuel Tank
« Reply #2 on: 08 September, 2019, 04:29:20 pm »
After leaving the cleaner in the main tank overnight I drained a heap more out of the tank. If I had kept it all I could have made another Ford,  a good 2 hand fulls of the stuff. So this afternoon I treated the tanks with the rust converter and should have time tomorrow afternoon to put the sealer in. Something that does take up time is getting the inside of the tank dry before changing from cleaning to rest prevention and then making it ready for the sealant. Because of the filler tube I was using a heat gun for a while then sticking the compressed air down the hole and sealing it with a rag. At first I kept the tank level but as you cannot see what is going on past the bottom of the tube I tilted the tank up at 45' and any moisture would run down beneath the tube. So I kept up the process until it was all gone.
Cheers, John & Dee. Coopernook. NSW.

Thomas Tisch

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Re: Treating a Rusty Fuel Tank
« Reply #3 on: 08 September, 2019, 06:43:39 pm »
Hi there,
I had rust in the fuel tank of my old Mercedes and just filled it up with Molasses and left it there for three months. After rinsing it was nice and clean and back to bare metal. After it had dried I "coated" it with a mix of Diesel and engine oil. Being slack on that project I haven?t installed it back yet after two years. It is still clean inside with no sign of new rust. I believe these tanks weren?t coated inside from new. The worry I have with acid or caustic cleaning is to get it free of that stuff again before getting the sealer in. Real trouble would start then if you were to get rust later between the sealer and the tank.
Cheers,
Thomas Tisch

cobbadog

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Re: Treating a Rusty Fuel Tank
« Reply #4 on: 10 September, 2019, 10:14:40 pm »
G'Day Thomas,
I too have used molasses to clean up rust on parts but inside the main tank was extremely bad and required a tough approach and time is not on my side as we have some treks comming up soon. The process used for the KBS is odd to say the least. Step 1 to use the aqua kleen to wash the insides and to start to pre treat the rust. This got a bit suddsie when the rinsing started and it took a lot of rinsing to get a clean liquid to run out and no bubbles. During this stage I did manage to get some on my hands and it didn't burn.
Step 2 using the rust blaster as it's called. They say this does have an acid in it similar to phosporic acid which is what is used on all rust converters and again this took some doing to get it to rinse clear and it took an overnight soak in the stuff to really shift the scaley rust but it did loosen it and again a lot of rinsing clear. I then let it stand for a day and yesterday afternoon I looked inside and there was still a bit of scale inside and I took the advise and bought a magnet to remove the last bits. So then I poured the sealant into both tanks and rolled it all about and drained out the excess after about 1/2 - 3/4 of an hour of rotating it around. It took around 10 minutes for the excess to stop running and dripping out and I was always clearing the fuel outlets so they did not get blocked. Today I looked inside and all appears to be perfect so soon I can look at respraying the tank again as I scratch it taking the scuttle plate off.
I will post some pics soon.
Cheers, John & Dee. Coopernook. NSW.

cobbadog

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Re: Treating a Rusty Fuel Tank
« Reply #5 on: 11 September, 2019, 04:20:51 pm »
Here is the result of the messy process but a great result.
Cheers, John & Dee. Coopernook. NSW.