I'm not really sure where it's appropriate to post this. Can anyone give me some advice concerning cleaning a fuel tank? I let fuel sit in my 67 fastback too long... I'm not really sure how long it sat in the brand new fuel tank, but I'm guessing 6 months, maybe longer, but certainly not years. Regardless, the fuel stinks horrible... I had only put a few gallons in it to test run the engine and probably only burned a half gallon or so. After I noticed the smell I drained the fuel and have not run the engine since. It's now been at least a year since I fired up the engine and I really want to get it running again. However, the empty fuel tank still smells horrible and I fear it might be varnished up. Is this a concern? I don't dare remove the tank because I know the mastic ribbon sealer will pull the paint off and it's a concours restoration still in progress. Should I put new fuel in with some SeaFoam, let is sit a few days, drain it out, refill with new gas again and then start the engine? Am I worrying too much due to the horrible odor?