tank studs
Question: Are these the ones which are on the top of the tank, which hold the filler neck in place? If so, I wouldn't recommend drilling unless you FILL the tank with a non flamable, non corrosive liquid, and then it would be best to have it out of the car and use a pneumatic drill rather than an electric.
Otherwise: Try screwing them into the tank if you can get ahold of the protruding studs with a small vise grip, and turning to get the remainder of it in. You're going to have to take your time with it because you're probably dropping more gunge into the tank, and should consider cleaning it out completely once you remove the studs and procure replacements, (hopefully stainless).
taegdh
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