To set the EIS fuel to your full setting
From page 6 of the Rev P EIS manual, section 3.2:
2. If the instrument includes the fuel flow option, review or update the fuel quantity setting as necessary. (Pressing the outer two buttons of the EIS will bring up the fuel quantity set page. While on this page, pressing the "UP" and "DOWN" (left and center buttons) will set the fuel quantity to whatever you have entered on the "MAX Fuel" setting on the configuration set pages.)
So press the outer two buttons then the left and center buttons and your fuel is set to your full setting. I think you will need to press another button to return to the default screen, but I've forgotten that bit.