![]() You need to use “fuel transfer from” or “fuel transfer to” to change this tank’s fuel level Trim – like an AUX tank, but never automatically transferred to or from.Aux – this is the opposite of a feeder tank: it cannot feed the engine directly, but it is used to keep the feeder tank full as long as possible with the automatic transfer pump.If a feeder tank exists, the engine will only get its fuel from the feeder, while other tanks can provide fuel to keep the feeder full. Feeder – this is a tank that feeds an engine and is always kept full from the other tanks on this side with an automatic transfer pump.Normal – this is the default and retains the logic directed by the pump pressure.In addition to the pressure, a tank can now be assigned a role: Firewall shutoff valvesĬommands for the left and right firewall shutoff valves (sim/fuel/fuel_firewall_valve_lft_open, etc.) have existed in X-Plane since before version 11. New to X-Plane 11.35 is the ability to change fuel pump pressure at run-time via a dataref, allowing precise control over which tanks will be providing fuel at any given time.įor example, on a 737 the center tank pumps provide a higher pressure than the wing tanks, therefore, the center tank is first emptied before any fuel is taken from the wing tanks. This is comparable to the system of override pumps, found for example on a 747. fuel selector to “left” with multiple tanks on the left side), the pump with the highest pressure will supply the fuel until its tank is empty. When multiple tanks are available according to the fuel selector setting (e.g. By giving tanks individual fuel pump pressures, designers can control the order in which X-Plane is going to empty the tanks. This is a setting in Plane Maker that has existed for a long time, even before X-Plane 11. ![]() By setting a different arm for the full tank, X-Plane will accurate simulate the mass and balance effect of the fuel in such tank arrangements. King Airs are notable examples of where the fuel arm changes with fuel level. On some planes the arm itself changes as fuel is used from an oddly-shaped tank, and the moment changes by both the weight difference and the arm difference. Normally, the moment of the fuel in a tank is expressed by the arm of the fuel tank, multiplied by the fuel weight. New to X-Plane 11.35 is the possibility to enter two longitudinal arms for the fuel tank position, one for empty and for full (by default, X-Plane just copies the arm of the empty tank to the full tank). X-Plane 11.35 comes with a few additions to the fuel system, in order to make it more flexible for third-party developers, hopefully removing the need to override it in many cases.
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