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Fuel Rails are a life time part really. they do have o rings that could fail. but thats rare. if you take the injectors out of them you should install new o rings as a normal part of the job.
Like what @Scottydoggs and @Fless said, the rails should be ok for the life of vehicle. Prying on them wrong can bend and damage them and create leaks. If you look at my build thread you will see lots of parts replaced before they went bad but even though I did new injectors and throttle body, the fuel rails are the same.I have an '04 Tahoe LT and was wondering how long do the Fuel Rails last? She's got 126,500 on her so far. TIA