My 2000 Chevy cavalier has had a check engine light on for years and auto zone told me that its due to an emissions leak. I replaced the gas cap and replaced the gas filter with no success.
4 Answers
Turn key on and off about 3 times then see if it starts if it does the check valve on sending unit in tank needs replaced
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It could be you fuel pressure regulator. Very common.
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Thanks @TransAm77 it appears that it was the fuel Pressure regulator, changed it out and it has been working 100 times better.