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If the tank is of uniform vertical section (it does not taper vertically) and if the tank is installed on the level, then the relationship between the tank level and the quantity it holds is linear.
If the tank is not of uniform vertical section, then that linear relationship is lost, and the fuel guage will have to be calibrated.... marking the dial is one way.
If the tank sensor is if the "Tank Tender" type, then it works by measuring the pressure needed to blow bubbles down a wee tube into the tank, with the outlet for the bubbles near the bottom. Again, it will need a uniform vertical section or it too will need calibrated. It will need calibration anyway, methinks.
Personally, I use a dipstick, and read it off my calibration chart. It is reliable and simple, and costs next to nothing. The tank is not a uniform section, so I need the calibration chart.
Last edited by Rockter; 01-01-2009 at 08:15 PM.