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Low Pressure Lights (Fuel) under cross feed switch - on from startup regardless of fuel load

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    Low Pressure Lights (Fuel) under cross feed switch - on from startup regardless of fuel load

    I am new to the NGXu and do not recall having this problem with the NGX - those low pressure lights are on whenever I start the NGXu, regardless of the fuel load I place on board, and I can't find whereabouts in the service failures menus to reset them. Can someone please advise?
    Brian Robinson Flight Simulation since 1984 - from Bruce Artwick FS for Commodore 64 to Lockheed Martin P3D!

    #2
    Sounds like you have the center pumps on without enough fuel in the center tank. When you have a problem like this one, you need to be more specific. There are 6 low pressure lights. Which ones are on? How are the fuel pump switches positioned? Just post a screenshot of the fuel panel and the fuel quantity.
    Omar Josef
    Spain

    Comment


      #3
      When Brian refers to the lights below the crossfeed valve switch then I guess it's the center fuel pump low pressure lights.
      How much fuel is there in the center tanks? Below approx 1000kg you could already encounter momentary flashes of the low pressure lights when you're riding over bumpy surfaces.
      If the tank is empty you of course need to turn off the tanks pumps, else the lights will come on.

      Please provide what Omar asked for and I'm sure we'll be able to help you better.

      Comment


      • DDowns
        DDowns commented
        Editing a comment
        I read somewhere that takeoff and climbs with less than 4000 lb in center tank requires that center pumps be off. I presume it's to prevent cavitation with takeoff and climb deck angles.

      • Emi
        Emi commented
        Editing a comment
        We use formally 453kg, on the line normally 1000kg.
        Preventing the pumps running dry is actually the reason, but only secondary, sort of.
        The main reason is that if you get any master caution below 80kt you have to stop the takeoff.
        With the acceleration during the takeoff run and of course all those potholes in the runways the fuel can flow to the back of the tanks, making the pumps run dry and causing the Master Caution - Fuel to flash which would result in a rejected takeoff.
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