Hi,
If that is gas, we have a concern. No, that shouldn't happen. Do me a favor. Check the engine oil level. See if it is overfull and if it has a fuel smell to it. I have a feeling the knock you were hearing was a cylinder nearly full of gas. Liquids don't compress.
When you replaced the fuel pump, did you confirm fuel pressure was within spec? Was the fuel pressure regulator inspected?
If that is gas, then it is likely getting into the engine due to excessive fuel pressure, a bad injector, or a bad cylinder.
If you haven't, here is a link that explains how to test fuel pressure. Do this as well and let me know the results.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Let me know what you find with the engine oil.
Take care,
Joe
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Tuesday, September 7th, 2021 AT 7:45 PM