Fuel
Calibrating the fuel usage can improve the ac-
curacy of fuel measurements.
Twin engine installations require each fuel trans-
ducer to be calibrated. This can be done at the
same time with two portable tanks or at different
times using one portable tank.
Calibrating the fuel transducer(s) requires accurate
measurement of the fuel consumption. This is
best done using a small portable tank. At least 4
gallons (15 litres) of fuel should be used to ensure
an accurate calibration.
It is often very difficult to fill underfloor tanks to the
same level twice due to air pockets, so the more fuel
used, the more accurate the calibration.
To calibrate the fuel transducer(s), perform the
following steps:
1. Record the level of the fuel in the tank(s).
2. Connect the portable tank(s) to the engine
through the fuel transducer(s).
3. Run the engine at normal cruising speed until
at least 4 gallons (15 litres) of fuel has been used
per engine.
4. Check the actual amount of fuel used per
engine by refilling the portable tank(s) to the origi-
nal level and noting the reading(s) from the fuel
dispenser’s gauge.
5. Select
Fuel
. Use the cursor keys to change
the reading for each engine to match that on the
fuel dispenser’s gauge.
6. Press
ENT
when the reading is correct.
Note:
If the fuel calibration options appear to give
erroneous readings after a while, first check that the
fuel sensor has been installed correctly according
to the installation instructions supplied with it. Then
see Appendix B - Troubleshooting.
Keel offset
Keel offset is a depth correction representing the verti-
cal distance between the depth transducer and the
location from which the depth is to be measured.
Enter a
positive
keel offset value when the trans-
ducer is located below the water surface but the
total depth is required.
Enter a
negative
keel offset value when the depth
below the deepest part of the boat is required (such
as the keel, the rudder or the propeller) and the
transducer is located closer to the water surface.
Use the cursor keys to select
Keel offset,
then
press to display the Keel offset box.
Use the or cursor keys to adjust the value.
Note
: Boat illustrated uses a through hull transducer
Water surface
Depth of transducer
Negative
value
Transducer
Positive
value
Warning:
Extreme precautions must be
observed when carrying out this
procedure.
Failure to do so could create
hazardous conditions that can
cause serious personal or
property damage.
FISH 4500/4600
Installation and Operation Manual
14
NAVMAN
Summary of Contents for FISH 4500/4600
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