NorthStar Navigation EXPLORER 657 Fuel functions and display, What the fuel computer does

12 Fuel functions and display

The Fuel functions require optional petrol/gasoline or SmartCraft™ fuel sensors to be installed and set up.

12-1 What the fuel computer does

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)

! 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.

Northstar Explorer 657 Installation and Operation Manual 45