Why would a car smell like gas after a tune up?

A car may smell like gas after a tune-up due to a few potential reasons. It could be from a loose or damaged fuel line, improper reassembly of components, or a faulty injector that was disturbed during the service. Additionally, spilled fuel during the process could also cause a lingering odor. If the smell persists, it's important to have the vehicle inspected to ensure there are no leaks or other issues.