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45Northstar Explorer 657 Installation and Operation Manual
12 Fuel functions and display
The Fuel functions require optional petrol/gasoline or SmartCraft™ fuel sensors to be installed and set
up.
Each engine has a flow sensor installed to
measure the engine’s fuel flow.
The 657 uses these flows, together with boat
speed and engine RPM if available to estimate the
fuel remaining in the tank(s), fuel used, range and
fuel economy. This data is displayed on the fuel
window (see section 12-2).
You can:
display the fuel used during a trip
(see section 12-2)
set low fuel alarms (see section 12-4)
make fuel consumption curves - graphs
of fuel consumption and boat speed as a
function of engine RPM - to monitor and
optimise boat performance.
(see section 12-6)
12-1 What the fuel computer does
!
WARNING
To ensure the fuel data is accurate:
When you add or remove fuel from a
tank, tell the 657 (see section 12-3)
If the boat has petrol/gasoline sensors,
calibrate them during installation or if
the fuel readings seem inaccurate (see
section 12-7)
Choose an appropriate type of boat
speed sensor to calculate economy,
range and the fuel consumption curve
(see section 12-5)
If the boat uses a paddlewheel sensor
to measure speed, calibrate it during
installation or if the speed readings seem
inaccurate.
12-2 Fuel window
To go to the Fuel window, press , select
More, then select Fuel.
The display differs according to the number of
engines and tanks. If engine RPM is available
and if you have made and selected a Fuel
Consumption Curve (see section 12-6), press
to switch between a Summary or a Fuel curve
display.
The Fuel window shows
Speed
To select a boat speed sensor, see section 12-5-1.
RPM (if available)
If engine RPM is not available, the display shows
depth.
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 12-4), 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 window and:
In a single engine boat, press and
select Clear used.
In a multi-engine boat, the fuel used by each
engine and the total fuel used are shown.
Press , select Clear used and
select:
Port or Starboard to clear the fuel used
by one engine
Both to clear the total fuel used.