I was able to wedge my smallest ¼" open-end wrench on each of the forward nuts and then nudge the respective bolt head about a 1/32 of a turn at a time with a socket extended down between the fuel lines aft of the selector.
What a bear!!!!
RV-8 N118KB (#81125) - Sold
RV-14A N114KB (#140494)
Standard kit begun 5/18 - FWF in progress