Garmin GFS 10 - Manual (Page 6)

EN–
ExAMplE: When you set the Flow Adjustment
to +10% , a flow rate of 20 gal./hr (75 l/hr) would
change to 22 gal./hr (82.5 l/hr), because
20 gal. × 110% = 22 gal. (75 l × 110% = 82.5 l).
By default, when wired to a fuel gauge, the
GFS 10 automatically detects the type of fuel
gauge. If the fuel-level reading on your Garmin
chartplotter or marine instrument appears to
change with the engine RPM, the GFS 10 could
be detecting the wrong type of gauge. When
the boat is not moving, place the engine in
neutral. If the fuel-level reading changes when
you throttle the engine, change the gauge type.
Go to the configuration options for NMEA
2000 devices on your Garmin chartplotter
or marine instrument to specify your type of
gauge (1 coil or 2 coil).
NoTE: It is normal for the fuel level to change
with the motion of the boat. Perform this test
when the boat is not moving.
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