[bbbentley]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: scuncio</div><div class="ubbcode-body">Thanks for the tip guys. I have used the vinegar trick on motorcycle tanks. Would you recommend the Eastwood coating afterwards to prevent it from rusting? </div></div>

Eastwood, yes, I endorse this product. I have used it on a Model A Ford. Will even seal small pin holes. Rust or holes would be the only reason I would seal though. All the other suggestions IMO were acceptable good ideas and I have tried everything mentioned in this post. The Eastwood product has you rinse a diluted muriatic acid solution. This works faster than the vinegar. See if you can get one of those flexible scopes that allow you to see inside (as long as it is not a long neck) and that will tell you the condition so you will know how to proceed. Of course if tank is out, take out the sender and look. That sloshing with gravel or a handful of nuts out of the bolt bin that Bergy mentioned is great for knocking of loose scale. I have used a small mortar mixer and strapped the tank on it and let it rotate for an hour or so.