Fuel
Warning:
Extreme precautions must be observed when carrying out this procedure.
Failure to do so could create hazardous conditions that can cause serious personal or property damage.
Calibrating the fuel usage can improve the ac- curacy of fuel measurements.
Twin engine installations require each fuel trans- ducer to be calibrated. This can be done at the same time with two portable tanks or at different times using one portable tank.
Calibrating the fuel transducer(s) requires accurate measurement of the fuel consumption. This is best done using a small portable tank. At least 4 gallons (15 litres) of fuel should be used to ensure an accurate calibration.
It is often very difficult to fill underfloor tanks to the sameleveltwiceduetoairpockets,sothemorefuel used, the more accurate the calibration.
To calibrate the fuel transducer(s), perform the following steps:
1.Record the level of the fuel in the tank(s).
2.Connect the portable tank(s) to the engine through the fuel transducer(s).
3.Run the engine at normal cruising speed until at least 4 gallons (15 litres) of fuel has been used per engine.
4.Check the actual amount of fuel used per engine by refilling the portable tank(s) to the origi- nal level and noting the reading(s) from the fuel dispenser’s gauge.
5.Select Fuel. Use the cursor keys to change the reading for each engine to match that on the fuel dispenser’s gauge.
6.Press ENT when the reading is correct.
Note: If the fuel calibration options appear to give erroneousreadingsafterawhile,firstcheckthatthe fuel sensor has been installed correctly according to the installation instructions supplied with it.Then see Appendix B - Troubleshooting.
Keel offset
Keeloffsetisadepthcorrectionrepresentingtheverti- cal distance between the depth transducer and the location from which the depth is to be measured.
Enter a positive keel offset value when the trans- ducer is located below the water surface but the total depth is required.
Enter a negative keel offset value when the depth below the deepest part of the boat is required (such as the keel, the rudder or the propeller) and the transducer is located closer to the water surface.
Use the cursor keys to select Keel offset, then press 
to display the Keel offset box.
Use the or cursor keys to adjust the value. | |||
| Water surface | ||
|
| Positive | |
Depth of transducer | value | ||
Negative | |||
Transducer |
| ||
| value | ||
|
| ||
Note: Boat illustrated uses a through hull transducer | |||
14 | NAVMAN | FISH 4500/4600 Installation and Operation Manual |