Where is the fuel line reset button or switch on a 2000 Chevy Cavalier?

There is no fuel line reset button or switch on a 2000 Chevy Cavalier (or any car, for that matter). Fuel systems are complex and safety-critical; there's no user-accessible reset for a fuel line problem.

If you're experiencing fuel-related issues (like the car not starting, running poorly, or a fuel leak), you need to have it diagnosed and repaired by a qualified mechanic. A "reset" is unlikely to solve the underlying problem. The problem could range from a faulty fuel pump to a clogged filter or a more serious mechanical issue.