Simple
Cross over valve or solenoid valves
And a swirl pot
This sort of turns it into 3 separate fuel areas
So you get
Left Fuel tank to Low pressure pump to filter to change over valve to swirl pot
return from swirl pot to change over valve and back to lefttank
Right Fuel tank to Low pressure pump to filter to change over valve to swirl pot return from swirl pot to change over valve and back to right tank
Then Swirl pot to High pressure pump to filter to fuel rail to pressure regulator
Return from regulator to Swirl pot