Second flight of day, in which FF indications worked great the entire flight right after startup during the FIRST flight of the day, but not after engine start for the second flight of the day, in which 10 gallons of fuel were added prior to startup for the 2nd flight.
10 gallons of fuel added. At engine start for the 2nd flight after the 10 gallons were added, the fuel screen was entered to adjust estimated fuel remaining. The K-factor was not adjusted.