NorthStar Navigation Multi-Function Unit M84 - Manual (Page 81)

Northstar M121/M84 Installation and Operation Manual 80
19-6 Setup > Fuel
Fuel functions require optional fuel flow sensors
to be installed. Press
MENU
twice, then select
Fuel:
! WARNING
Fuel consumption can change drastically
depending upon the boat loading and the
sea conditions. Always carry adequate fuel
for the journey, plus a reserve.
Source
Select the fuel flow sensors to use if the boat
has more than one set of fuel sensors. Normally
select Auto.
Num engines
Set the number of engines, or select 0 to
disable the fuel functions. If there are two
engines they are called port and starboard.
Num tanks
Set the number of fuel tanks. If there are two
tanks they are called port and starboard.
Setup engines
If the boat has more than one engine, select
Engine and select each engine in turn.
For the selected engine, you can enter:
From tank: The fuel tank the engine is
connected to.
Flow filter: Most engines do not draw fuel
from the tank at a steady rate. To give a stable
fuel flow reading, the M121/M84 calculates
the flow by taking several measurements and
averaging them. Use the Flow filter to set the
period over which the fuel flow is averaged.
The Flow filter can be set from 0 to 30 seconds.
Use the lowest value which gives a stable flow.
Usually a value of 5 to 10 seconds will give a
satisfactory result for two-stroke carburetor
engines. Fuel injected or four-stroke engines
may require a larger value.
This setting affects the Fuel flow and Fuel
economy reading on the Fuel display but it
does not affect the Fuel used reading.
Setup tanks
If the boat has more than one tank, select Tank
and select each tank in turn.
For the selected tank, you can enter:
Tank size: The tank capacity. Northstar
recommends measuring tank size by draining
the fuel tank, filling it to capacity and using the
fuel dispenser’s reading. Beware of air pockets,
especially in underfloor tanks.
Fuel alarm: See section 13-4.