Where is fuel pump located on a 1985 chevy cavalier?

The pump is electric, and it is inside the gas tank. You have to drop and remove the tank to change the pump.
The filter is a small metal cylinder, about fist size, and will be in the fuel line under one side or another of the car, unless it is in the engine bay, just before the fuel line reaches the engine. I expect it would however be underneath, along a frame rail. Just follow the fuel line from the tank. Both ends of the filter are threaded. Use 2 wrenches, one as a back-up while you loosen the fuel line fitting. Be careful of damaging the end of the fuel line-that is why you want 2 wrenches.