Fuel calculations

Hello,

I just installed a new C97 and updated to the latest software revision. Currently on my network I have a pair of Lowrance EP-65 fuel level monitors and a pair of Fox Marine MEFI-3 engine interface modules. All components appear to be playing nicely with each other, The C97 displays the engine data from the engine modules and I get the fuel level data in % from the EP-65's. My problem is the C97 will not display total fuel volume. When I customize the fuel data page to show total fuel volume it displays nothing. I have set up the boat details in the C97 - two engines and two fuel tanks. I have set up total fuel for the boat at 225 gallons. I would think in order to get the total volume display I would have to tell the C97 the size of each individual tank. I haven't found that.

When I set the C97 to display Estimated fuel remaining and set the tanks to full fuel page will correctly display 225 gallons and then subtract fuel as the engines run.

I would rather have it display total volume so I do not have to estimate the fuel used by the generator and subtract it from the estimate fuel remaining.

Any ideas? What I am missing here? Thanks.