Originally Posted by
tae9141
ok so right side forward fuel tank is used as some of you mentioned, Is there a reason why it is turned on so?
no. The APU fuel source is the left side of the fuel manifold, normally supplied only by the pumps on the left side of the panel. Ie: either left main tank pump, or the left centre tank pump. You would have to open the fuel crossfeed valve to use any other AC powered pump. I have never seen a dc pump on the 737, but mention was made of such an option earlier.
The APU fuel pump will also self-feed, but with some longevity issues.