Question about 1983 Yamaha XS 400 Special

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How to clean a fuel tank after years of storage

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Remove the gas valve assembly. Get a cupful of 1/2" nuts from the hardware store and put them in through the gas cap. Add 1/4 tank of kerosene or other "slow to burn" solvent. Put the cap back on the shake the metal nuts all around inside the tank. The nuts will abrade the rust and gunk so you can get the tank nice and clean. I suggest you then use a liquid tank liner. Google kreem products as a source. Now the tank will never rust again and you will get clean gas.

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Posted on Sep 29, 2009

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Hi, you are going to have to pull the tank off of the bike. Make sure the petcock is closed. You want to get a real good rust inhibiter or solvent from your local parts store (auto stores will have something NAPA will have it for sure) and put in about a gallon or a little less. Put the tank cover on and swish it around to coat the entire inside of the tank. Get a brush, (wire if possible) one you can bend to get the walls of the tank and get deep inside and scrub as good as you can and let sit. leave the solvent inside the tank and repeat a few times even letiing it sit with the solvent in it for a day or two to penetrate the rust is it has it. Also be sur to put the cap on while sitting so the solvent won't evaporate. After all of that empty the solvent from the tank and use gas to thoroughly rinse out all the dirty solvent and be sure to get the sediment that will have collected at the bottom of the tank. In the rinsing process like after once or twice remove the petcock from tank completly to be sure it's free of any sediment. I hope this helped you. It would be greatly appreciated if you could rate my answer, Thanks. Good luck.....MIKE-

Posted on Sep 29, 2009

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If there is rust then you will need to put a little gas in the tank and put in a hand full of clean nut and bolts and put the cap on and shake the heck out of it to try and get as much rust out as possible. After it is cleaned I would get a tank sealing kit and seal it so it wont rust again.

Posted on Sep 29, 2009

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