Fuel window | 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
Economy
The distance travelled per unit of fuel used. The value can depend on the type of speed sensor (see section
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
12-3 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
On a
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.
BWhen you partially fill a tank
1Add fuel to a tank and write down how much fuel you add.
2From the Fuel window, press 
and select Add fuel.
3On a
4Change 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.
46 | Northstar Explorer 657 Installation and Operation Manual |