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Bobs Ten
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Date:  8-15-2020
Number of Hours:  10.50
Manual Reference:  
Brief Description:  Prepare Engine for First Start

1030 - 2100

Today was spent working on the fuel system. Fuel was retrieved and the Princeton fuel sensors were calibrated. This required us to determine a minimum fuel set point and a maximum fuel set point. Initially we set zero gallons for empty and then added approximately 23 gallons of fuel. This ensured the fuel level was above the sensor and that the sensor was saturated. The set points were entered in the sensors per the instructions.

This was repeated for the second tank.

We then needed to drain the tanks to calibrate the G3X system. Initially we set the zero point and then added the 23 gallons. the G3X then interpolated the fuel level from the two points. We repeated this for the second tank.

It was then we realized that the gauges were not accurate. After some consideration, we drained the fuel and recalibrated a second time, using a similar procedure. We ended up with unsatisfactory results.


We decided to perform the fuel pressure and fuel flow tests as we needed to empty the tanks. These tests were conducted in level flight attitude and max pitch attitude.

We first disconnected the fuel rail supply and presurized the system. The fuel was collected in an empty can. This was accomplished to flush the systema and both left and right sides we done.

An analog pressure gauge was installed in the supply fuel rail. The system was pressurized and fuel pressure set to the recommended static pressure of 35 psi. The analog guage was then compared to the G3X sensor. There was a slight difference and the pressure was adjusted.

Next, the analog gauge was removed. The return line to the left tank was disconnected. An extension was fabricated so that the return fuel could be collected and measured. Three gallons of fuel was added to the tank. We then pressurized the system and timed the flow of one gallon of fuel. The test was repeated with another gallon. The last gallon was then timed for a three way average. We also measured the unusable amount of fuel which was approximately 3 ounces.
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