MGL Avionics Stratomaster Maxi Single Flight II Manual page 13

Fill your tank to an approximate known level (perhaps marked using a felt pen). Set the FF-3 to
calculate fuel level from fuel flow (disable the fuel level sender using the menu function
"LevelSend").
Set the fuel level to read 40 liters – the exact value is not important.
Now fly of a quantity of fuel, perhaps 25 liters as example (very roughly – it does not need to be
exact). Note the reading of the fuel level after you switch off the engine. Assume we are reading
28 liters now (we used 22 liters according to the instrument).
Now fill the tank again, exactly to the previous level. Measure how much fuel you need to get to
this previous level using a measuring jug.
For example, assume we need 26 liters to get back to the previously marked fuel level. This
means the fuel level should have been at 24 liters as we started with a value of 40 liters.
This example would mean that our fuel flow sender is under reading by four liters as it has not
measured the correct quantity of fuel.
Now start adjusting the K-Factor so your tank level changes from 28 liters to 24 liters. You would
adjust the K-factor down in this case (fewer pulses per liter of fuel).
Using this calibration method you can get to very accurate fuel flow readings. The initial accuracy
of fuel flow readings is dependant on the viscosity or type of fuel you use, added oils, installation
and finally the temperature of the fuel.
A good installation can achieve about a +/- 3% accuracy with as little as 1% error after calibration.
Tank size
Enter the size of the fuel tank in your system. It is recommended to choose a size that is slightly
less than actual size so you can compensate for sender inaccuracies and give you a measure of
reserve fuel.
You should perform this setting before you perform the fuel tank calibration.
Enter your tank size even if you do not use a fuel level sender. If you use a fuel flow sender this
value will be taken as being the maximum amount of fuel that you can enter for a calculated fuel
level reading.
Fuel tank Calib
This function enters the fuel level sender calibration menu. The fuel level sender needs to be
calibrated before it can be used with this system. The calibration allows the system to learn the
shape of your tank as well as any errors your fuel level sender or installation has.
Note: You only need this function if you are using your Flight II with a physical fuel level sender,
there is no need for this function if you are using calculated fuel level using the fuel flow sender.
The six
calibration
points from
zero fuel level
to full tank
The current level
sender reading
Level sender
readings at the
calibration
points