3scort TD-150 User Manual page 23

Fig. 27 CNT, level and physical fuel level
ATTENTION! If you covered the drainage holes of the sensor before,
make sure to unblock the drainage holes after the calibration is over!!!
Otherwise, when you put the sensor into the tank, the fuel will not be able to
go up the tubes because of the air trapped inside and the level reading will
not change no matter how much fuel you put into the tank
.
Fig. 28 Unblock the drainage holes
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