AJaromir Posted December 16, 2024 Posted December 16, 2024 (edited) From the manual - page 33: When the fuel selector (fuel cock) [11] is set to "Auf", both fuel lines from the forward and rear tanks are allowed to feed fuel to the booster pump. The booster pump draws more fuel than actually needed from both tanks and the surplus is routed back into the forward tank, thereby closing the valve for the forward tank. With this mechanism fuel effectively is drawn only from the rear tank as long as the engine gets enough fuel from it. When the engine pump starts to starve, the forward tank is "opened". If I understand correctly, an excess should cause the highlighted non-return valve to close. I deliberately had the front fuel pump off and the rear fuel pump on, and tried flying 1km above the ground in the most economical mode, but even then the behaviour described in the manual did not happen. Fuel continued to be drawn evenly from both tanks. The only way to stop fuel being drawn from the front tank was to manually close the fuel valve. Considering that the behavior of the system does not match the description in the manual, I consider it a bug. Edited December 16, 2024 by AJaromir
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