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Building Integrity
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Date:  7-17-2018
Number of Hours:  0.50
Manual Reference:  Section 2
Brief Description:  Intake is too large

When planning the new overhead air intake box, I had to map out a dozen different things to get an installation that worked. One of the difficulties was finding a way to install a large enough air filter, while not having a large intake scoop. Unfortunately, my intake is much larger than it needs to be which is causing a problem with my fuel tank vents.
The design was suppose to allow the vented fuel to be drawn back toward the air box and then drain back down the drain tube and out the oil cooler scoop. What I'm seeing though, is that the fuel is going back into the scoop about 2" then REVERSING direction and going forward then out of the scoop!!! This is telling me that the scoop is taking in more air than the engine needs which doesn't allow the fuel to be sucked back. Not only is this drag, but also creates a real mess on the airplane. Admittedly, I should have added a second vent line to the tanks which I built them, but I was afraid of deviating from the plans. A second vent line is a must! For now, the only solution I see without doing major vent line surgery, would be to reduce the size of the intake inlet until the reverse airflow stops. I can most likely create temporary plugs to reduce the size of the inlet for testing. The good news is that this means a solution that is lower drag.
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Fuel stains show reverse flow

Fuel stains show reverse flow

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