Bimmer making high-pitched sounds?

[Interceptor]

As the title says: for the past few days I've been hearing high-pitched squeal from the back of my car - it seems like the sound is coming from the area where the tank is located. Fuel pump bearing? Does anyone have a clue about this one?

Thanks in advance!

[Mobius]

Could very well be the fuel pump. It occurs at a constant pitch and only while the engine is running?

[Interceptor]

Could very well be the fuel pump. It occurs at a constant pitch and only while the engine is running?
Yes, exactly! Fuel pump bearing? Should I ignore it and wait for the fuel pump to fail or launch a preemptive strike? What's worse that can happen if I ignore it?