There's no such thing as a "power stereo pump", either someone is BSing you or you misheard them for something different.
The power steering pump is located just above the alternator on the drivers side of the car. An easy way to locate it on a 1991 Honda Accord is to first locate the dipstick for your oil, then directly next to it is a pulley, this pully is mounted on youyr power steering pump, and is your power steering pump pulley.
it is located behind the power steering pump on the engine block
Next to the power steering pump
try www.autozone.com
where is the electric power steering pump loca ted on a 2005 chevy malibu 3.5 liter engine
Between the power steering pump and the water pump. The only one of two pulleys that is smooth versus grooved.
What is the cost to replace a watrr pump on a 97chevy cavalier
Locate the reservoir, follow the hose, you will see it.
its on the right side of the valve cover, near the power steering pump.
The Cavalier fuel pump is located inside the fuel tank. The tank has to be removed from the car to get access the fuel pump.
It is driven by a belt. Follow the belt and you will find the p/s pump if it has one. It may have manual steering. The reservoir is part of the power steering pump.
low fluid would cause this or the pump could be going out