I have a non-s-3500 and a 3400 in my Glastar Sportsman built by PCA and the panel worked fine for 50 hours. Lately when refueling I realized that I could put in only 80 liters although the EFIS stated that I had used 100 liters. The fuel flow reading in level flight at 75% power LOP are also higher than before and therefore adding up more fuel used.
Is there an easy way to change some parameters in the EFIS to correct this mis-reading in a simple way?
The fuel flow transducer used on my Lyc IO390 engine is of the the type: "little red little box" - sorry, but I do not recall the exact type and the plane)
Regards
Andreas