The AFPR is a
"Smart" Auxiliary Fuel Pump Relay. This device allows the pilot to flip one
switch and quickly drain the contents of the auxiliary fuel tank without over
stressing the auxiliary fuel pump. The AFPR will pump down the auxiliary fuel
tank, and then automatically shut the fuel pump off when no fuel is detected.
The AFPR includes a very reliable optical fuel sensor that can be easily
installed in the auxiliary fuel tank or in the fuel line. The AFPR can be
operated in and one of four modes of operation. The AFPR also has an output that
can be used for a light to indicate when the fuel pump-down has been completed.
The AFPR was
designed to mount near the fuel pump/auxiliary fuel tank. This eliminates
running extra wires thru the wing or fuselage. This mounting method also allows
the installer to use a shorter run for the fuel level sensor wiring and not use
additional wiring through the wing. The AFPR can also be installed in the
fuselage if limited space is a factor.
MODES OF OPERATION
The AFPR can be
operated in one of four modes of operation.
Low Fuel Detect
When energized, the AFPR pumps the auxiliary tank down until it is empty, then
Low Fuel Detect w Maximum Fuel Usage
as "Low Fuel Detect" except that the pump will continue to pump for 10 seconds,
every 3 minutes. This ensures that every drop of fuel in the tank is transferred
and used. When the pilot turns the switch off, all pumping will stop.
The next two modes
can be operated without the fuel sensor. (model AFPR-ns)
Pump Down for 1 Minute
When energized, the AFPR pumps down the auxiliary tank for 1 minute and stops.
Pump Down for 3 Minutes
When energized, the AFPR pumps down the auxiliary tank for 3 minutes and stops.
For all modes of
operation, after the AFPR has finished pumping the tank down and stopped, simply
turn off the AFPR. This will reset the AFPR. Applying power again will repeat
We can do custom
programming of the Pump Down Timing if 1.0 and 3.0 minutes does not work for
your application. There will be a small fee for the custom modification.
USE of OTHER FUEL LEVEL SENSORS
Can you use other fuel level sensors?
YES, if they are compatible with our sensor output. The output should be
an "open collector" or a TTL (0 to +5V) type output. The output must be
high in air, low in fuel. Please read below for 0 to 3.3V outputs.
Can you use a Pillar Point Fuel Sensor?
Well, maybe. The Pillar Point sensor has an output that is an open
collector output (BLU wire), but it is not compatible because it has the
opposite output response. The only output that is compatible, is the 0 to
+3.3V output (WHT wire). We have tested it and it does work. This
output is compatible with the APFR and the HTAF. On the HTAF2, only the
"Start Sensor" input will work. You cannot use the Pillar Point sensor for
the "Finish Sensor" input on the HTAF2. Please email us and ask, . . we
are working on a version of the HTAF2 that will work with opposite polarity
Input Power: 12Vdc or 24Vdc, 0.1A
Enclosure: 3.5" x 2.25 x 1.25"
(89mm x 57 x 32mm )
Fuel Sensor Mounting:
The sensor threads are 1/4 NPT. The leads are about 5" long.
Torque: (13.26 in.-lbs. (1.5Nm)) Max.
DO NOT over torque the sensor!