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Originally Posted by NiftySVX
It may not cause a noticable change in driveability, but it is part of the emission control system and needs to be in place. There is no telling what it might do without it. Definatly just get a new one, if for no other reason than to just eliminate it from any diagnostic process.
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What it does and does not do, is definite and specific. Provided the fuel cap is not faulty there can be no affect on the operation of the engine.