I've been out from under the hood of cars for 30+ years, so if my suggestion is silly, please understand.

Back in 1970, I chased a knock in a 327 chevy for many months before I realized that the fuel pump push rod had a slight bend and wasn't staying seated. Anyway, you may have an electric fuel pump and this wouldn't even be applicable.

By the way, I'm getting back into cars ('34 Tudor Sedan) and I have enjoyed coming to this forum to browse.

Dan J