Garmin G3X Installation Manual page 584

Fuel Quantity Calibration Data Backup – This option allows the user to back up fuel calibration data to
an SD card placed in the SD card slot of the PFD. Access the Read/Write Calibration File menu by
pressing the Menu key when displaying the Fuel Quantity Calibration Page
Write Calibration File – Stores fuel quantity calibration data to a file on the SD card. Calibration data is
saved to the /Garmin/cal/ directory on the card. This data storage must be repeated for each calibrated tank
(if backup is desired).
Read Calibration File – Reads the stored fuel quantity calibration data from the SD card.
Fuel Flow Calibration – The Fuel Flow input requires calibration as detailed below.
K-Factor – Enter the 'K' factor for the fuel flow sensor (Section 21.3.11.1).
When installing the fuel flow sensor, the installer should take note of number on the tag attached to the
sensor (if applicable). This number is the calibrated K factor of the sensor. For sensors that are not
supplied with a specific calibration value, use the default K factor value provided.
The K-Factor represents the number of electrical pulses output by the sensor per gallon of fuel flow.
Aspects unique to each installation will affect the accuracy of the initial K-Factor, and as a result, the K-
Factor must generally be adjusted up or down to increase the accuracy of the fuel flow calibration.
If the fuel usage reported by the G3X differs from the actual fuel usage, as measured at the fuel pump (or
other trusted method of measurement), use the following formula to calculate a corrected K-Factor, which
can then be used to calibrate the fuel flow.
Corrected K-Factor = ( [G3X reported fuel used] x [previous K-factor] ) / [actual fuel used].
Full Fuel – Sets the Full Fuel quantity for the fuel computer. Set according to the fuel tank capacity (set to
zero if not used).
Partial Fuel 1 & 2 – The Partial Fuel values may be used if the fuel tanks have 'tabs' or some other method
of putting in a known quantity of fuel (other than completely full tanks). If the Partial Fuel function is not
applicable or not desired, these settings can be left blank or set to zero.
190-01115-01 G3X/G3X Touch Installation Manual - GDU 37X Config and Post Install Checkout
Rev. AA Page 31-132