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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 12, june07
Installation FF -2 & FF-4
Connecting the senders
This image shows the connection of one flow sender and one fuel level sender. Connections for the
second pair of senders omitted for clarity, they are identical.
Fuel flow sender
Please observe the installation notes supplied with the fuel flow sender. Should you install a
different fuel flow sender to that supplied by MGL Avionics, ensure that you enter the K-factor
relevant for your sender.
Some senders require a pull-up resistor to the 12V supply line. We find most installations of these
senders require a 4K7 pull-up resistor.
In all cases ensure that fuel flow through the sender is continuous and smooth.
Nearly all flow senders related problems are due to choosing a bad position in the fuel supply line.
Any fuel flow sender will be negatively effected by having to measure pulsed fuel supply such as is
created by most mechanical or pneumatic fuel pumps or by carburetor float valves that open and
close continuously. Nearly every installation would require a suitable fuel reservoir to help create a
smooth fuel flow for the sender. This can be easily created by installing a fuel filter before
AND
after the flow sender.
+
-
Alarm
S
+
DC
Level
FF-2
Fuel computer
TransZorb 33V
Protection
Fuse
Power Switch
Alarm lamp or LED
1W Max
+12V from battery
Ground
(Chassis)
Red
Blue
Braid
Fuel Flow sender
Level sender
Resistor (if LED)
This wire not needed for FF2-B
since the left contact is internally
connected to +12V
12V
