Under the back seat there are two access panels to the tank. The fuel pump/sender unit is under the O/S panel and the other sender unit is under the N/S. You can tell the difference as the fuel pump and sender combined unit will have two electrical connectors. The solitary sender only has one and a fuel return pipe i think.
The fuel pump relay is located behind the glove box. Remove the glove box to gain clear access.
Changing car parts has its challenges. It is not too hard to change the BMW 323i water pump, if a person has all the right tools, experience and time.
Get them fixed.
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The name of the AC hose for a BMW 323i is the AC vacuum hose. The hose can also be called the AC pump pressure hose.
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On the motor
The fuel pump in located in the fuel tank on a 1991 BMW 525i. This model of BMW uses an electric fuel pump.
For BMW 323i. the company recommends to use only synthetic 5w30 or 5w40 !