NAVMAN
8120/8084
Installation and Operation Manual
50
13-3 When you add or remove fuel
When you add or remove fuel, you must tell
the 8120/8084, otherwise the fuel data will be
meaningless.
A When you completely fill a tank
Go to the fuel display and press
MENU
.
Then:
On a single-tank boat, select
Fill tank
.
On a multi-tank boat, select
Fill tank
,
then select the tank you have filled.
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.
B When you part fill a tank
1 Add fuel to a tank and write down how
much fuel you add.
2 From the Fuel display, press
MENU
and
select
Add fuel
.
3 On a multi-tank boat, select the tank that
you have added fuel to.
4 Change the number to the amount of fuel
that you added.
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.
Fuel flow
The fuel flow for the engine(s). On a multi
engine boat, the data for the port engine is
on the left of the display. Use the flows to
check the load of each engine.
Range
The estimated boat range at the current fuel
flow. The value can depend on the type of
speed sensor (see section 13-5).
Economy
The distance travelled per unit of fuel used.
The value can depend on the type of speed
sensor (see section 13-5). The larger the
value, the better the fuel economy. Adjust
the throttle and trim to achieve the best
economy.
Fuel consumption curve
A graph of fuel consumption and boat speed
as a function of engine RPM. Use the curve to
monitor and optimize boat performance (see
section 13-6).
Remaining
The fuel remaining in the tank(s) is shown as
a vertical gauge on the right of the display.
The height of the yellow bar(s) show how
much fuel remains in the tank(s). If you have
set a low fuel alarm (see section 13-4), a red
bar shows the level at which the alarm will
trigger. If there are two tanks, the left bar
shows the port tank, the right bar shows the
starboard tank.
Used
The fuel used during a trip. On a multi-engine
boat, the data for the port engine is on the
left of the display.
When you want to start measuring how much
fuel is used, go to the Fuel display and:
In a single engine boat, press
MENU
and
select
Clear used
.
In a multi-engine boat, the fuel used by
each engine and the total fuel used are
shown. Press
MENU
, select
Clear used
and select:
Port
or
Starboard
to clear the fuel
used by one engine
Both to clear the total fuel used.