*** Edit -- I just looked at the thread mentioned by IvanK, and Scrim does appear to be on a similar path. My findings revealed a bigger problem with the fuel system; they are as follows:
I am experiencing a bug with the drop tanks. I've tried to reproduce this problem a couple of ways to make sure it's broken, but feel free to correct me If I'm interpreting this incorrectly. Full realism enabled; no unlimited fuel or anything like that.
Scenario 1, mid-flight:
Started with full fuel and only 2x 200 gal outboard drop tanks on the hardpoints. I flew the plane with “OUTBD ON & JETT” selected on the left fuel/jett panel and attempted to BINGO the aircraft. After approx 1 hour and 20 mins @ 40,000 ft and 0.82 Mach, the Fuel Quantity read "1150" (46% and 15,800 lbs total weight from the loadout menu, alt+').
The Sabre would not show a value lower than this.
I flew for another 15 minutes and the Fuel Quantity remained the same. I changed the tank selector to "ALL TANKS OFF" and fuel started to burn correctly. At "900" lbs of indicated fuel (~40%, now at 15,550 lbs total weight), I switched it back to “OUTBD ON & JETT” and the fuel quantity gauge started to rise back to "1150"! The loadout menu said I was now at 46% fuel and 15,800 lbs total weight once again. I gained fuel and weight just by moving the selector.
***
Scenario 2, ramp:
I started with 2x 200 gal outboard tanks and 100% fuel. I requested a clean plane and 10% fuel ("220" lbs of Fuel Quantity, 11,892 lbs total weight from the alt+' menu) from the ground crew.
I made sure the fuel/jett selector was set to "ALL TANKS OFF" and I asked for 2x 200 gal outboard tanks; they also topped up the bird to 10% fuel (some was used while idling). With my newly fitted drop tanks and the Fuel Quantity now showing "220" lbs, I moved the selector to “OUTBD ON & JETT” and watched the needle rise to "1150" lbs! I ran the engine on the ground at 2750 rpm for several minutes; I burned no fuel. I moved the selector back to "ALL TANKS OFF" and throttled up with my brakes engaged. The tank drained normally to "900" lbs, at which point I selected "OUTBD ON & JETT”. As expected, the needle went back to "1150" lbs (46% fuel, 15,800 lbs total weight).
I have not tried this extensinvely with the "INBD ON" 120 gal tanks, but one test from the ramp yielded the same result, showing "1150" Fuel Quantity and 46% fuel that would not burn.
***
My concern started when I noticed that the "OUTBD TANKS EMPTY" lamp never illuminated during long flights. I started to wonder when the fuel system was actually draining from those drop tanks.
Hope this helps, I have noticed a couple other things as well but I want to make sure it hasn't already been found. I love the work you guys have done on this plane!