Fuel Functions And Display; When You Add Or Remove Fuel - Navman Datahelm 8120 Installation And Operation Manual

13 Fuel functions and display

The Fuel functions require optional fuel sensors to be installed.

13-1 When you add or remove fuel

When you add or remove fuel in a boat
with no SmartCraft fuel tank level sensors,
you must tell the Instrument, otherwise
REMAINING, RANGE and the low fuel alarm
will be meaningless.
A When you completely fill the tank
1 Fill the tank.
then select Fuel.
2 Press
SETUP
3 Select Tank full.
Note: Underfloor fuel tanks are often difficult
to refill to the same level twice, due to air
pockets. With underfloor fuel tanks:
Trim the boat to the same angle in the
water each time you follow procedure A.
Mostly use procedure B below when
adding fuel, but completely fill the tank
and follow procedure A about every tenth
time you add fuel.
46
B When you part fill the tank
1 Before adding fuel, go to the fuel window
and write down the value of Remaining,
which is the amount of fuel now in the
tank.
2 Add fuel to the tank, writing down how
much you add.
3 Add together the two figures you have
written down, to calculate the amount of
fuel now in the tank.
then select Fuel.
4 Press
SETUP
5 Set Remaining to the amount of fuel
that you calculated was now in the tank.
Note: If you follow procedure B every
time you add fuel, then a small error will
accumulate, because it is hard to measure
exactly how much fuel you add. To avoid this,
completely fill the tank and follow procedure
A about every tenth time you add fuel.
C When you remove fuel
Repeat procedure B, but subtract the fuel
you have removed from the original amount
of fuel in the tank to calculate the amount of
fuel now in the tank.
8120 Installation and Operation Manual