HOW DO I CHANGE MY FUEL PUMP ON MY 92'325I.

you need to drop the fuel tank out of the bottom to change the pump

Yes you can just change the fuel pump, there are genuine and aftermarket options available, You need to remove the original pump from the cradle and this will allow you to confirm the size of the replacement pump.

George,
No simple diagram for changing the fuel pump. It is located inside the gas tank. The gas tank needs to be removed to change the pump. The pump is part of an assembly which consists of the pump, fuel gauge sender and pick up. You also need to change the fuel filter when you change the pump. It should take a professional mechanic about 3 hours to drain the fuel out of the tank, remove the tank, change the pump and fuel filter. Multiple the mechanic's time by whatever the repair shop charges per hour for labor. There are several different pump assemblies for the vehicle. Price depends on whether it's 2 or 4 doors and 2 or 4 wheel drive. Best guess is about $600 total.

It is really important to check the fuel tank regularly to ensure that the fuel pump is in good condition and pushing the fuel properly to the engine. Here you can get necessary details to change the fuel pump http://www.carpartswarehouse.com/part/fuel-pump.html

Recalibrate to the PCM

Did you change the fuel filter? If not change it. Is the fuel pump actually running? Listen at the fuel filler with cap off while someone turns on the ignition without starting the engine. The pump should run for a few seconds. If not, check the fuse and fuel pump relay.

Check the fuel pressure at idle with a fuel pressure gauge connected to the fuel rail.

Could be clogged fuel filter or fuel pump is weak.

This usually happens when the lift pump gets worn and fuel pressure drops below 7lbs and the injection pump has to work harder by pulling in the fuel and will destroy the pump,your is probably a vp44 fuel injection pump it needs replaced and they are expensive 1200.00+ but also change the lift pump or change to a fass fuel system,if the lift pump went out and you replace the injection pump it will ruin it in a short time.
The injection pump is not an easy job to change or for a novice mechanic as it has to be set in time with the engine at top dead center,and then the whole fuel system needs to be bleed of air.

replace fuel pump /fuel filter/screen/keep enough gas in tank at least 1/2 tank of gas at all times and change gas filter at 10,000 miles

yes u should change the fuel pump