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Old 10-20-2014, 10:07 AM   #1
_Iceman_
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place to remove rust from inside fuel tank?

Anyone know of a place in town or near? I am starting to rebuild a 1984 Z50R & noticed some rust on the inside of the tank.
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Old 10-20-2014, 10:30 AM   #2
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This kit works extremely well if you don't mind DIY http://www.hirschauto.com/prodinfo.asp?number=ARK-01
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Old 10-20-2014, 10:46 AM   #3
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are you salvaging the factory paint or repainting. . .if repainting, have it hot dipped at your local radiator shop.
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Old 10-20-2014, 11:20 AM   #4
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I'm just going to repaint it so I'll definitely look into it.
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Old 10-20-2014, 12:12 PM   #5
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This is what i did with one of my bikes:
Depending on size of the tank buy a few gallons of regular vinegar.
Find a way to seal/plug the hole at the bottom that connects to the fuel line.
Add the vinegar and let it sit for a week or longer depending on rust level.
Pour out and add baking soda and water.
You can then coat the inside of the tank with a product called "redKote". It works great
Let the kote cure for at least a week to make sure its solid.
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Old 10-20-2014, 12:39 PM   #6
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use vinegar to break apart the chunks of rust. Then phosphoric acid to seal and coat the tank and convert any other rust into a different non rust form. Total cost 20 bucks
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Old 10-21-2014, 07:43 AM   #7
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Quote:
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use vinegar to break apart the chunks of rust. Then phosphoric acid to seal and coat the tank ...
Quote:
Originally Posted by Donte View Post
...
You can then coat the inside of the tank with a product called "redKote". It works great
Let the kote cure for at least a week to make sure its solid.
How are these coats applied? Are they something you pour in the tank or have to spray? I wonder because the fuel cap on this tank is fairly small.
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Old 10-21-2014, 09:22 AM   #8
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Quote:
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How are these coats applied? Are they something you pour in the tank or have to spray? I wonder because the fuel cap on this tank is fairly small.
You pour it in the tank and rotate in all directions to get a even layer. Let that coat cure for a day or two. Add second coat to make sure you got all parts of the tank. Then let cure for a week.

Some tanks are harder than others in that they have small nooks and crannys that you will never know if you coated that spot or not.

Their are videos on youtube explaining how to remove rust with multiple methods.

I DO NOT recommend using the nail trick to scrape some of the rust off. Even with a magnet it was a huge pain to get them all out. Im pretty sure i even coated over a few of them because i could not get them all out.
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Old 10-21-2014, 11:10 AM   #9
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For the phosphoric acid, I just bought that at homedepot. You literally coat phosphoric acid for 15-30minutes because it converts the rust quick.

When I did my tank, I let the vinegar soak for a 1-2 days. But the phosphoric acid was <30minutes. It's been 1 year and no issues for me.
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Old 10-21-2014, 12:03 PM   #10
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Oh yeah, once you dump out the vinegar, put in the phosphoric acid asap. Otherwise the tank will flash rust.
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Old 10-21-2014, 12:13 PM   #11
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I have the kit with the acid, conditioner and the liner if you want it. I've done it one and worked great. You just have to take your time. I can show you what I know. btw and still on the original package like this one.
http://www.revzilla.com/product/kree...FQ4LMgodUU8AMg
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Old 11-03-2014, 09:14 AM   #12
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Tried the white vinegar method. Pic 1 shows results after 4 days of sitting. Not too impressive. Pic 2 shows results after a refill and sitting 3 more days. A lot of gunk. Tank looked pretty clean inside. Decided to refill with Apple Cider Vinegar and will let it sit overnight before applying the phophoric acid. Thanksto all for the info.
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Old 11-04-2014, 09:51 AM   #13
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Here's the result after all the cleaning.
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Old 11-04-2014, 10:13 AM   #14
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as for the phosphoric Acid, I'm not sure if I did something wrong, but after coating it and letting it cure over night the tank sufferd from flash rust. I'm going to clean it again this eve and use the Red Koat sealant this time.
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Old 11-04-2014, 10:59 AM   #15
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Flash rust can happen very fast, i think within min. After i poured the vinegar out i put in the baking soda and water. Get as much of the water out as you can. Then i added acetone because it evaporates fast. This helps to get most of the remaining water out. Next i put a hair dryer on LOW-NO heat to get out any remaining water. Thats when you need to be getting any additional supplies you might need for a coat of any sealer.

With the sealers it takes a good 20-30 min of turning the tank over and rotating to get a good even coat. You want to make sure there are no large puddles siting. If there are it may never cure and when gas is added the puddle could burst. I had a few small puddles but let my take cure for about 3 weeks. Never had a problem. Its recommend you do at least 2 coats to make sure you got everywhere in the tank, and gives it additional protection.

If you use red kote some have noted that it can turn your gas red for a while. The discoloration is not suppose to dilute the gas or cause any harm just a warning. Mine did this for the first few fill up, and never had a problem.

Good luck
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Old 11-04-2014, 12:01 PM   #16
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Flash rust can happen very fast, i think within min. After i poured the vinegar out i put in the baking soda and water. Get as much of the water out as you can. Then i added acetone because it evaporates fast. This helps to get most of the remaining water out. Next i put a hair dryer on LOW-NO heat to get out any remaining water. Thats when you need to be getting any additional supplies you might need for a coat of any sealer.

With the sealers it takes a good 20-30 min of turning the tank over and rotating to get a good even coat. You want to make sure there are no large puddles siting. If there are it may never cure and when gas is added the puddle could burst. I had a few small puddles but let my take cure for about 3 weeks. Never had a problem. Its recommend you do at least 2 coats to make sure you got everywhere in the tank, and gives it additional protection.

If you use red kote some have noted that it can turn your gas red for a while. The discoloration is not suppose to dilute the gas or cause any harm just a warning. Mine did this for the first few fill up, and never had a problem.

Good luck
Excellent response. This is better than any Youtube video I saw. Imust have watched all of them
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Old 11-04-2014, 02:24 PM   #17
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