LOL my 5.0 has a pump in the tank and its the loudest noise on the car when its running Maybe a stock 4 cylinder pump is quiet,/anything that feeds any kind of hp will make lots of noise.
My pump is not that big either and its the first question I always get,whats that buzzing sound
Good luck on quiet in the tank.
My current hotrod has the pump mounted on the frame with rubber isolators and braided hose about 10 inches long on both the input and output and seems to be much more quiet than the in the tank deal and alot more repair friendly,/.....have you ever tried to change a in the tank pump with 8 or 10 gallons of gas still in there? not fun.......