Q: A diagnostic test showed an issue with the fuel pump of my 2008 chevy Colorado; should I replace it?

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The check engine light came on yesterday. A diagnostic test showed an issue with the fuel pump. I understand that replacing the gas cap will often fix the issue. The truck otherwise runs great. It also has less than 92,000 miles, and had a full engine replacement at 79,000. Should I replace the gas cap, or the fuel pump?

My car has 92000 miles.
My car has an automatic transmission.

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