Spent couple of hours adding 2 gallons at a time to right (only) fuel tank and marking known levels with labeling tape. I ended up putting 15 gallons into 14 gallon right fuel tank. Seems I didn't account for 1 gallon or so in the header tank. I placed gallon amounts with "arrow" to level noted on site gauge at bottom of meniscus.
Will have to go back and replace numbers to account for 1 gallon in header tank.
I did quickly find reason for massive fuel leak when pumps activated. I had forgotten I had not totally tightened one fuel line connection into large fuel filter after fuel pumps. My intent was that fuel flow requirements would be met before finally tightening.
After filling right tank, I used fuel pumps to empty main tank and determined that fuel pumps put out at least 2/3 gallon per minute. I needed 9 gph and my pumps put out almost 40gph.....more than enough but needed for high pressure for fuel injection.