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THE best outline about the fuel system can be found in the following
[https://www.golfmk7.com/forums/index.php?threads/does-the-mqb-fuel-system-defy-physics-aka-why-do-i-need-a-huge-fuel-pump.367016/ thread].
== Flexfuel ==
The ECU will do automatic mass fuel flow (mff) compensation based on ethanol content. It can do this both with a sensor or sensorless.
By default, the calibration is set up to leverage a "manual" ethanol setting (which is what the ED code short circuits for the slider). When configured in automatic mode, the ECU will use algorithmic based flex fuel adaptation. By enabling a sensor (pinned to pin 71 [need to verify]), the ecu will instead use the sensor unless the sensor fails.
<pre>
Switch to use manual alternative fuel ratio
lc_fac_afu_ratio_man_act - set to [00] to disable
Logical value to indicate AFU sensor configuration
lc_fac_afu_ratio_conf - set to [00] to enable the sensor (not a typo)
</pre>
It also might be helpful to enable the PID output for e-content (PID 52)
Details start on page 23709 of the FR.
c_state_srv_1_pid[n][10] is the bit field that includes pid 52.
