Ma ran over a chunk of metal on the highway and put 2" by 3" hole in the side of a metal gas tank. After nursing it halfway home, one mile at a time, (it would have overheated from tearing off the heater hoses to the rear heater), I built up a patch with Mopar RTV sealer, (the gray stuff that gets a little harder and seals through any residue). Never smelled the fumes from then on.
While making hose repairs, I wanted to protect the "temporary patch" from rocks, so I covered it with a thin piece of tin. To protect that from rust and corrosion, I added another layer of RTV sealer. That temporary patch has been on there for over 15 years and has never leaked. It's still my daily driver. The tank has been over-filled many times.
I'm sure Ford and GM have the same RTV sealer with their own name on the tube. I just used the Mopar stuff because I was familiar with it. If it can hold up to that, I bet it would work to seal your tubes. Just be sure to remove any dirt and loose material. To remove it later, you'll have to cut it with a knife.
By the way, it works real good too for sealing arcing high voltage transformers in picture tube-type tvs!
Sunday, March 28th, 2010 AT 6:28 PM