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Northstar M121/M84 Installation and Operation Manual 47
13 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 M121/M84 use 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 display (see section 13-2).
You can:
display the fuel used during a trip
(see section 13-2)
set low fuel alarms (see section 13-4)
make fuel consumption curves - graphs
of fuel consumption and boat speed as a
function of engine RPM - to monitor and
optimize boat performance.
(see section 13-6)
13-2 Fuel display
To go to the Fuel display, press
DISPLAY
, 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 13-6), press
to switch between a Summary or a Fuel curve
display.
The Fuel display shows
Speed
To select a boat speed sensor, see section 13-5-1.
RPM (if available)
If engine RPM is not available, the display shows
depth.
13-1 What the fuel computer does
!
WARNING
To ensure the fuel data is accurate:
When you add or remove fuel from a
tank, tell the M121/M84 (see section 13-3)
If the boat has petrol/gasoline sensors,
calibrate them during installation or if
the fuel readings seem inaccurate (see
section 13-7)
Choose an appropriate type of boat
speed sensor to calculate economy,
range and the fuel consumption curve
(see section 13-5)
If the boat uses a paddlewheel sensor
to measure speed, calibrate it during
installation or if the speed readings seem
inaccurate.
Fuel display