The Bearhawk Fuel System as shown in the Bearhawk Book is designed for use without a fuel pump.
If a fuel pump is used, extra care in flying is required so that neither main tanks become unported, as a fuel pump would rather suck air than fuel.
If one tank is very low and the other is not very low, set the fuel selector on the fullest tank and fly the plan as not to unport that tank.
A header tank (3 gal) could be used to solve this problem, but fuel in the cockpit can be a safety issue. (Vent the header tank to both main tanks)