Other Fuel System Pump problems of the 2014 Toyota Camry

We purchased a certified used 2014. 5 Toyota Camry from baxter Toyota in April 2014. The engine has always run a bit rough and we had it checked by baxters service department several times and were told that "that was normal for that particular year, however, with the 2020 recall on the fuel pump issue it sounds like we may have the same problem and would appreciate if we could at least have our fuel pump check out in accordance with the recall.

I went out to the garage to verify that the garage door was closed and heard something humming in the garage. Upon investigating the sound it turned out to be coming from under the rear of the car. The only thing that made sense to me was the fuel pump was running. I proceeded to get the keys and cycled the ignition to on without starting the car and then back to off. The humming stopped. I did remember hearing a second humming sound start and stop when turning the key to the on position, which would be the normal fuel pump cycling for an engine start sequence. I am wondering if what I originally heard may have been a relief valve slowly bleeding off pressure, but I am not sure if there is a relief valve somewhere in the back of the car. I disconnected the battery overnight for piece of mind. This did all occur between 4-5 hours after the car had been parked. I will be contacting my Toyota dealer regarding this problem.