Ron:
Here's a direct answer to your question:
If the tank has a horizontal flange around it that the gasket rests on or is attached to (either way...), then you can put a virtually permanent seal on it. Here's how:
Clean the area of the lid that the gasket comes into contact with, and the flange where contact is made, thoroughly. (Strip the glue with suitable solvent.) I've found that the best "prep" is to take a wire brush that fits a drill and "sand it out" with the brush, using the drill to do the work.
On the flange, squirt a bead of silicone about 3/8" to 1/2" wide, all the way around and let it skim over. (In cold weather, it could take several hours. In hot weather, it takes about 2.)
Apply a good car wax (I used Turtle Wax.) to the underside of the lid (where you used the wire brush), and along the vertical part as well, being sure to cover an area that's wider than the width of the tank flange. Let it dry and buff. Repeat 3 times.
When the silicone has skimmed over and is beginning to feel firm to the touch, put the lid on and weigh it down in order to compress the silicone. (I used a concrete block... about 15 lbs. or so)
Let it set over night or longer if you can. (Over a weekend is ideal.)
Remove the block and gently "Pop" the lid off. (It will appear to be sealed. You'll have to pry it slightly and may need to work around the edge, but probably won't.
Once you get the lid off, you're set for years... I've seen seals like this last close to 10 years.
Good luck...
Duane