AF330

Hi everyone,
I had these questions:

Wikipedia: "A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action. Pumps can be classified into three major groups according to the method they use to move the fluid: direct lift, displacement, and gravitypumps."

1) How does the pump work? With fuel? But what is the use? Is it to move the fuel?
Could you just have a photo of it while moving something?

2) There were pipes, to bypass the pump stuff, but the pipes shouldn't have valves, so basically the fuel can also go inside even if there are no pump failures, or is there something else so that it doesn't go inside it at any time?

3) What is the horizontal and vertical guidance for an RNAV approach, for example the glideslope or the LOC for an ILS approach?

4) How does a plane knows where to go? With GPS?

5) When a VOR has been captured, does it still use GPS?

When the plane is ditching the packs closes.

6) Does all the ventilation system closes?

7) Do the outflow exits close?

8) Do the outflow valves close?

9) If the plane is ditching, you still need air below 12500 ft. But the packs are not working while ditching. So will the "last air" that was there will remain to maintain that pressure at least till we level off or stop ditching?

10) Are the A330 QNH autopilot change altitude when we pass the QNH from standard to the real QNH?If not, why?

11) When are QNH is 1018, our airport altitude is below sea level, isn't it?

Thanks a lot,

Kind regards,
AF330