Today was spent primarily working on the fuel system.
We decided to drain the tanks again and recalibrate the G3X. This time, the previous calibration points were first deleted. We then decided to put 1 gallon of fuel in the tank and set that point as the new zero. We then added two gallons at a time, setting a calibration point at each addition. We continued this process until the output voltage from the Princeton sensors was at it's maximum of 5 volts. This occurred at approximately 18 gallons. This process was then completed for the opposite tank.
Inspecting the gauge reading, we found that setting the maximum tank capacity to 30 gallons, the gauge would stop reading at a little over half and the numerical value was at 30, even though there was only 18 gallons in the tank. A call to Garmin verified that this was correct because the sensors were saturated at 18 gallons. We decided to set the tank value to 18 gallons. This reset the gauge to read full. It should now remain full until it gets to 18 gallons, at which point the sensor will be less than saturated and the gauge will accurately indicate the remaining fuel from 18 to zero. When the gauge reads zero, the remaing fuel will be 1 gallon as that is what we set to be unuseable.
The next task was to test and time the ER tanks. The tanks were filled to 7.5 gallons and the pump started. A timer was also started. The pump ran for 15 minutes and shutoff. The test was repeated on the opposite side with the same result. The timer was reset and the tank pumped dry. This required a total of 24 minutes, which agrees with the pump data sheet.
The timers will be reprogrammed to 23 minutes to prevent the pumps from running dry.
