Originally Posted by Keefvscott
...I'll just check on a fuel pump and see what it does after installing a new one.
I did not mean to say you should replace the fuel pump, but I do agree that this might be your problem.
The BIGGER picture was multiple thoughts. If your going to replace the fuel pump module, you must/should attempt to remove and test that old filter to see if it has resistance (is clogged?) and replace if needed. This is especially important in your situation where nasty gas might have caused other problems, such as clogging that filter and maybe even affected the upstream HPFP.
Your situation is also X2, X4 problem compounded by the suspected water damaged engine bay; water damaged car.
Good luck, and you might need extra luck. Burn a candle tonight or this weekend. Look into the stars at night, and pray to any God that might shine down upon you.