Originally Posted by
Polorutz
There are two electrical pumps for each inner wing tank. Also for each inner wing tank there is only one gravity feed.
Depending on the model, you can either have 2 center tank pumps or 2 jet pumps.
If there is a jet pump, what they do is transfer the fuel from the center tank to the inner wing tanks. If it's the older model they each go to an engine.
How is the fuel fed from Center tank by gravity (new Jet pump model)? Last 2T are unusable alright but how is the rest used in case of ELEC EMER? Is the Jet pump a mechanical pump or merely a suction creating mechanism?