The fuel filter is part of the fuel pump. It doesn't need to be changed unless the fuel pump goes bad.
the fuel filter is found on the frame rail near the firewall on the drivers side
Where are the spark plugs on a 2004 mazda rx8?
it is located in the fuel tank
directly underneth the Brake cylander in the engine bay on the drivers side, it is easiest to get to from underneth!
50L
It is up above the rear axle housing. It looks like a bear to get to, but isn't too hard to replace.
16 Gallons
The first four are located on the passenger side under the intake manifold. And the last two are located under the first.
regular unleaded or 87
15 gal.
If you are looking into how a rotary engine works go here: http://auto.howstuffworks.com/rotary-engine.htm This will also explain the fuel injection part of the engine, I think this is what you are looking for.
You have to remove the fuel pump from inside the gas tank. The fuel filter and inlet strainer are attached to the pump.