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Fuel quantity input problem after SU10

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    Fuel quantity input problem after SU10

    Hey guys, just did a flight on the PMDG 737-800. I went manually to add fuel to my flight on the FMC fuel page and entered 21500 lbs. I only got 21121 lbs loaded. Tried with a different quantity and the one I enter is not the one displayed, always a lot less. The loading of the aircraft was 50% so it was not a weight issue etc. It used to be exact before the update.
    Anyone of you having the same issue?

    Teofilo Homsany

    You do not say how you are refueling. Are you using the quick-load method or the fuel truck? You also say that the correct quantity is not displayed - displayed where?

    If I use the quick load menu and load 21500, the quick load menu shows 21500, and then switching to the fuel truck menu, without changing fuel quantity, it shows 21565 onboard. The Upper Display's fuel gauge shows 21.6, but it is rounding to the nearest tenth (21.565 rounded up) - adding together the individual tank displays comes to 21.57 which is 21.565 rounded to the nearest hundredth. The Init Ref page of the FMC shows 21.7 - I can't figure out how it comes up with that.

    If I use the fuel truck method and request 21500, then after fueling is complete, the fuel truck menu shows it loaded 21501 and the quick load menu shows 21438. The Upper Display's fuel gauge shows 21.5, - adding together the individual tanks comes to 21.49. The Init Ref Page of the FMC again shows 21.7.

    I do not see a discrepancy as large as you see. Of the discrepancies I do see:

    Some of the difference seems to be the result of rounding errors.
    Some, I suspect, is randomization to simulate reality. I have never refueled a plane, but suspect that it cannot be done to the nearest pound.

    The difference in quantity shown on the Upper Display vs the Init Ref page is strange, but maybe this is a quirk of the real plane. The difference in quantities between the Quick Load page and the Fuel Truck page is also strange.
    Last edited by PositiveZero; 22Sep2022, 19:16.
    Chuck Vo


      Hi Charles I go into the FMC, FS ACTIONS > FUEL and enter the total fuel on the fuel quantity on the top left. I enter a value of 21000 and when I press the button to apply it, it shows 20300 instead of what I wrote. That's what I mean. I hope this clears things up.
      Teofilo Homsany


        So, if I understand you correctly, you enter 21500, and then that number you entered changes to 20300. That is strange.

        In the past, Sim Updates have caused User Settings to change.

        Try the following and see if it helps:

        In the sim, go to Options> Misc, and see what Units of Measurement is set to. Try setting it to U.S. System. Maybe this setting was changed on you by the update. Could be that there is a weird bug between the sim's measurement system and the airplane's measurement system. Only thing I can think of to try.

        Chuck Vo