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Northstar Explorer 657 Installation and Operation Manual46
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 12-5).
Economy
The distance travelled per unit of fuel used. The
value can depend on the type of speed sensor
(see section 12-5). 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 optimise boat performance (see
section 12-6).
Fuel window
12-3 When you add or remove fuel
When you add or remove fuel, you must tell the
657, otherwise the fuel data will be meaningless.
A When you completely fill a tank
Go to the fuel window and press
.
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 partially fill a tank
1 Add fuel to a tank and write down how much
fuel you add.
2 From the Fuel window, press
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.