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John (Jack) Clark's Web Site
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Date: 6-12-2014
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Number of Hours: 0.00
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Manual Reference:
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Brief Description: Fuel Guardian Optical Low Fuel Alert System Test
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Fuel Guardian Optical Low Fuel Alert System Testing was started today by first measuring the fuel quantity in each tank with a dipstick using measurements that were obtained during the first tank fillups. The right tank measured 9 gallons and the left tank measured 7 gallons. I flew first on the right tank since it had the most measured fuel. Fuel was visible in both tanks meaning that there was at least five gallons in the tanks. Less than 5 gallons no fuel would be visible.
I flew about 35 miles to the northwest to maneuver near the airport in the area. At 6.3 gallons per hour at a loitering power setting that yielded about 115-120 kts, it seemed to take for ever for the fuel level to drop. There was 4 gallons registering on the right fuel guage as I started the circling of the airport at 4000-4100 feet. Very slowly, the guage dropped to 3 gallons then to 2 gallons. All the while, I was anticipating a flame out thiking that the Fuel Guardian was failing and that the right tank guage was reading falsely high. Several unknowns, all of which could cause a flame out from fuel starvation. I was prepared to switch tanks, turn on the fuel boost pump and re=start the engine at the first sign of faultering. If no re-start, then I was positioned for a dead-stick landing at the field below. But once I reached 2 gallons and no light on the right tank, I decided to go back home since I knew I had enough fuel for this in the left tank and an unknown quantity in the right tank. I circled over the home airport and at one gallon on the right guage, the Fuel Guardian light illuminated. I switched to the left tank for the approach and quickly, the Guardian light for the left tank illuminated.Filling the tanks, the right tank had 2 Gallons remaining and the left tank had just under 6 Gallons. Results: 1. the guages are fairly accurate 2. the right tank is very low before the light alarms. In the worst case scenario, the left tank would be drained until the low level light illuminates and then the right tank until
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