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MGL Avionics
Fuel management FF-2 & FF-4
Install & User’s manual
© 2002-2007 MGL & Delta Omega
www.delta-omega.com
Page 8, june07
Setup
Select the “Setup” function to enter the setup menu for your selected mode. The pictures and
descriptions here show all available functions. Depending on your mode selection some of these
items may not be visible if they are not required...
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Select “Done” when you are finished here
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Set the size of your tank(s)
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Enter the K-factor of your flow sender(s) or injector(s)
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Enter the fuel tank level sender multi point calibration
system
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Enter the “low fuel level” alarm for your fuel tanks
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Select the units of measure for your application
T1, T2 size
Enter the size of the fuel tanks 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.
K-Factor 1, K-Factor 2
The K-Factor is the number of pulses generated by the fuel flow sender for one liter of fuel. The
dual range fuel flow sender supplied by MGL Avionics has a K-Factor of 7000 in the low flow mode
(jet installed) and 1330 for the high flow mode (no jet installed).
You can use the K-Factor to calibrate your fuel flow sender.
Calibration procedure
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Fill your tank to an approximate known level (perhaps marked using a felt pen). Set the
FF-2 to calculate fuel level from fuel flow (disable the fuel level sender using the menu
function “LevelSend”).
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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.
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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.
