For those experiencing this fuel issue, would you mind responding here and let us know the aircraft version number?
You can find this in My Library after you search the aircraft, or (preferred) you can bring up the Pacakages debug window in dev mode on PC, search for the aircraft, and provide the version number.
Thank you!
Same version numbers for me. I believe the last working version I had was 6.21 or something close to that
For A321: 6.27.0
For A330: 6.26.0
Same versions, but PC. And as @Azlog pointed out, somewhere around 6.20-21 was the last build that used tanks correctly and with normal consumption.
I update each beta (reinstall). For me the issue started in 1.6.25.0 on A320N. I briefly checked A321 and A330 noticed the fuel usage issue but didnāt play full flight on those aircraft. All streamed content.
Iāll just add that I have all of my default airbuses downloaded locally and still have this issue
can confirm this on the A321
Yes I was on a 8 hour flight today from VIDP to LIRF on an A330-200 GE and simbrief predicted fuel block 114,500 lbs. I even added an extra 10,000 lbs to be on the safe side so I loaded up 124,500 lbs at the start. However, as I started flying roughly after 1000NM of the total 3400NM trip, I noticed that my fuel tank was already under 50% of what I loaded up. At that time, the fuel consumption was 5500-6000 lbs/h per engine and there was no way I couldāve made the trip without running out of fuel. I was down to 47000 lbs fuel left with still over 2000 nm to go. I also noticed that both engines were running well over 92-94% N1 even when I lowered the CI to be under 5! Manually changing the wind to a stronger tailwind didnāt seem to help the matter at all either.
Aircraft version: 6.26
Same here; i flew the last version of A330 INI A330-200 flew LPPT-LPMA with 21.5 Tonnes, pqrked with 7T only ( took 75 mins extra fuel) an,d off course was not able to shut down the engines when parked fuel consumption was 0 but engies were still running, version of ACFT 6.26
hope soon it will be fixed,
Thank you
During multiple long-haul test flights in SU4 Beta (latest build) using both the Inibuild A330-200 and A330-300 (aircraft version 6.26), we observed a severe and reproducible fuel-burn anomaly that does not align with displayed fuel-flow indications, SimBrief data, or real-world A330 performance.
1. Unrealistic Fuel Depletion vs. Displayed Fuel Flow
At cruise, both variants show fuel flow around 5,500ā6,000 lb/hr per engine, which is consistent with real-world A330-200/300 performance.
However, actual fuel depletion during flight is 50ā60% higher than what the ECAM engine page indicates.
Example from our Zurich (LSZH) ā Shanghai Pudong (ZSPD) test flight:
Loaded ~164,000 lbs of fuel (SimBrief +10% contingency)
At TOC, FOB was ~130,000 lbs
Within ~7 hours, FOB dropped to 0ā800 lbs, triggering LAND ASAP
Actual burn rate calculated from depletion: ~18,500 lb/hr total,
or ~9,250 lb/hr per engine, far above realistic A330 cruise consumption
This strongly suggests that displayed FF is incorrect, and the aircraft is burning significantly more fuel in the background than indicated.
2. Behavior Consistent With a Simulated Fuel Leak
During the LSZHāZSPD flight, the aircraft behaved exactly as if experiencing a major fuel leak:
FOB decreased at an extreme linear rate unrelated to displayed FF
MCDU predicted EFOB rapidly dropped into negative territory
āLAND ASAPā appeared despite normal engine indications
Changing CI, optimizing climb, or encountering tailwinds did not improve depletion
The issue persisted after a clean restart and full SimBrief wind import
This points to a sim-level fuel system bug.
3. FMC Predictions Degrade Over Time
As the fuel mismatch grows, FMC predictions become unrealistic:
ETA drifts 2ā3 hours later than SimBrief
Remaining distance and fuel predictions diverge from reality
EFOB drops sharply even in stable cruise
Descent fuel planning becomes impossible
This drift occurred approximately 1ā2 hours after TOC during the LSZHāZSPD flight.
4. Reproducible Across Variants and Conditions
The anomaly occurred on:
A330-200 ā twice (Inibuild v6.26)
A330-300 ā once (the LSZHāZSPD flight)
SU4 Beta
Flights started cold & dark or from runway
With and without third-party scenery (including ZSPD)
Multiple SimBrief plans
Multiple cost index values
With full wind data imported
The behavior is not dependent on route, livery, payload, SimBrief profile, or setup.
5. Emergency Mid-Flight Refueling Required
During the LSZHāZSPD flight:
With ~2,000 nm remaining
FMC predicted ~30,000 lbs EFOB
Actual FOB suddenly reached ~800 lbs
A +80,000 lb emergency fuel load was required to avoid flameout.
After refueling:
Burn rate remained abnormally high
Example: ~2,000 lbs lost in ~10 minutes during steady cruise
Displayed FF remained ~6,000 lb/hr per engine, not reflecting true depletion
Conclusion
The Inibuild A330 (v6.26) in SU4 Beta suffers from a severe fuel-burn miscalculation where:
Displayed FF is incorrect
Actual burn is ~50ā60% higher than indicated
FMC predictions progressively degrade
Long-haul flights (10ā13 hours) become impossible on maximum fuel
Aircraft behavior resembles a fuel leak despite no indication of one
This issue renders long-haul A330 flights non-viable without manual refueling, even with significant fuel contingency.
Update for all Airbus aircraft this evening seems to have fixed this
A320v2 look like now is burning fuel as before the bug.
BTW I have to do a GA and: flying to the HOLD, turn back to the IAF and fligh the approach again, burned 1000kg.
Looks like a bit too much taking into consideration the planed block was 5000kg:
TAXI 173 (0.15)
TRIP 2284 1.01
CONT 5 MIN 185 0.05
ALTN 1354 0.38
FINRES 947 0.30
Description of the issue:
FOB (FUEL ON BOARD) is not accounting for center tank.
FOB is going up instead of going down when fuel from center tank is transferred into the wings.
Loading fuel is partially broken with incorrect amount loaded; Was supposed to load 6018 Kilos, ends up loading 9300.
Burns 20Kg of fuel around every 6 seconds.
From 9300 Kilos of fuel, i ended the flight with 11600 Kg ???
At some point during cruise, plane decided to start generating fuel out of thin air, instead of burning fuel, even Gross Weight of plane was going up by 20KGs with the fuel.
Video showcasing issues: https://www.youtube-nocookie.com/embed/hHPl9TRl4Ms
I can confirm this issue. I was having the same problem with the A321 last night. When I loaded the aircraft via the EFB, the wrong amount of fuel is loaded. Fuel burn is then much higher than it should be, with FOB dissappearing very quickly. The FOB then starts to increase and the aircraft is rapidly getting heavier and heavier, which then meant I was too heavy for landing.
Well, I just flew a short <300nm hop with A320Neo(v6.30.0) and the fuel was within 300kg of the predicted, so Iād say thatās about right. But since it was a short flight, center tanks were empty so I donāt know, I didnāt have above mentioned bonus fuel 
Edit:
Tried the A330 few hours later, but only spawned on the runway because I couldnāt fly, started the clock and gave it a bit of thrust. Itās clear that somethingās still not right with A330ās fuel burn:
After an hour, it used 200kg more than it should, which might not be a lot, but on a long haul flight of, say, 10hrs, thatās 2t more. It also developed a fuel imbalance of 200kg less in the left tank which corresponds to 200kg more that it burned. So on that 10hr flight, it would have developed 2t fuel imbalance as well. I donāt know what might be causing it, but devs should be able to track it down further
Immediately after loading the aircraft:
An hour later:
With 11000 burned there should be 43580 FOB, but thereās 43380. Itās almost as if it thinks that APU is running the whole time, which it clearly isnāt. Although I donāt have the exact figure for how much fuel the APU burns exactly on the A330, but it would explain it somewhat.
So Iāve been able to complete a flight with the A330-300P2F 1.6.30, a huge improvement to the fuel issue, didnāt have to refuel midair at all. 07:32h block time so should provide some good data.
From my ACARS I used:
In Leipzig I loaded 53,200kg however it only tracks from pushback so I assume that is APU usage to 53,144. My Simbrief planned trip fuel of 43,163kg compared with the ACARS data 43,294kg so farily close for a 7 hour+ flight.
Here is my FUEL ECAM page after parking up (note engines couldnāt be turned off until I zeroād out the fuel in the EFB as per another forum post.)
So the fuel remaining figure in the ACARS will be from touchdown so I assume 9,850kg to 9,660kg is a 190kg difference assumed as taxi in and APU usage. Fuel used is also very similar to the ACARS data only 146kg difference so rounding and taxi in/APU usage. I would say on the A300-300P2F this issue is resolved however I cannot confirm for other aircraft, especially those with centre tanks
A320 fuel usage has behaved for the last couple of flights for me too. Thanks for fixing this.
Can replicate the issue: Confirmed that fuel quantity on the A21N is increasing in cruise when the center tank pumps are on
BelugaXL fuelflow looks fixed with last update. burned 4 tons in 30 minutes in cruise.
Well done. 
Can also replicate the A321 infinite fuel with centre tanks on. If turned off then seems to reduce properly.
Latest update .31 sim and aircraft.
