Look under your sink for a round black plastic "air admittance valve".
Sometimes they go bad and allow tank odors to come up.
To troubleshoot, put a baggie over it and tape/tie it closed tight. If the smell stops, that's it. You can take it to a hardware store to match it with a new one (keep the bag over the pipe to keep the smell out).
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Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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