If it is just a small crack, it can be fixed. If it is questionable than just replace. Junk yards are a great place to find good used inexpensive parts, or a good place for new is partstrain.com. If it can be fixed you need to clean the surface inside and out. Be very careful to remove all dirt and grease, if you miss any the patch may leak. You can use a liquid weld for a patch. I would recommend JB Weld, use the 24 hour not the quick drying, it does not work as well. Follow the directions very closely to mix, and apply an even thin cote. Make it as smooth as possible so that you can apply a second cote if needed.
Good Luck
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