Electronics International FP-5 - Power-up Programming Mode Configuration

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Note:
The FP-5 will not account for any fuel used while in the any of the programming modes.
1. Power-up Programming Mode (Setting Full Fuel Level, K Factor, Filter and Loran/GPS Interface):
Display Modes
Power-up FLOW REM USED T. to E. PRESS
Programming
Full Fuel Level Display in
Gal, br Gal,
Lbs. or Ltr.
Add Fuel Low Fuel Reminder Alarm Time to Empty
Alarm
High Pressure
Alarm
Modes
K Factor Low Fuel Warning Alarm Low Pressure
Alarm
Filter
Display Update
Time
Loran/GPS
Interface
(FP-5L only)
In the Power-up Programming Mode the following functions may be set:
Full Fuel Level - The Full Fuel Level should be set for the total useable fuel for your aircraft as specified by
the airframe manufacturer in the Flight Manual or it may be set for a level to which you most often fill your
tanks. This value is used as a default level when programming the Fuel Remaining Level of the FP-5.
K Factor - The K Factor represents the number of electrical pulses per gallon the FP-5 expects to see from the
flow transducer. Changing the K Factor changes the accuracy of the FP-5. Initially, the K Factor should
be set to a value which is marked on the tag attached to the flow transducer.
Example: Value marked on tag: 16-8604.
16 = 16 gallon per hour bench test flow rate.
8604 = 86,040 pulses per gallon measured on the bench.
Set the K Factor on the FP-5 for the first three digits on the tag (860).
The differences between the elbows, fittings, pipe sizes, hoses and routing methods used during installation
and the fuel pressure for your aircraft can, for any fuel flow gauge, cause the flow transducer to output a
different number of electrical pulses per gallon (K Factor) than when it was tested on the bench. To correct
for any errors in the K Factor, keep track of the Actual Fuel Used (fuel required to bring the tanks back to
full) and compare this with the FP-5 Fuel Used (Full Tank Level minus Fuel Remaining as displayed on the
FP-5). If your error is less than 3 gallons for a single tank, you should average the error over 3 tanks of fuel.
Use the following formula to correct the K Factor:
Note: When refueling an aircraft fuel tank, it is not easy to fill the tanks to the same exact level each time.
New K Factor =
Actual Fuel Used
(FP-5 Fuel Used) x (Current K Factor)