Fuel calculations

[Chuck - Raymarine - Moderator]

Welcome to the crosscr,

The LightHouse II software is designed to merely report tank level as a percentage using data from PGN 127505. It sounds as though you may be incorrectly assuming that Total Fuel (vol) is calculated by multiplying the percentage of fuel within the tank by the tank's volume. The Total Fuel (vol) data item is instead dependent upon data from PGN 127497 Engine Trip Parameters. Should this PGN not be supplied by your system, then the Fuel Manager setup may be configured to calculate Est. Total Fuel Remaining based upon fuel consumption rate data ... should this be available within the system. Should the MFD be used to calculate fuel consumption, then it will only provide estimated fuel values, as it possible for the engines to be operated while the marine electronics remain OFF, leaving fuel consumed during such periods as unaccounted for.