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Chasing a phantom fuel leak on a Cessna for 2 weeks and it was a $4 o-ring
Had a 172 come in with a slow fuel smell in the cabin last month at our hangar in Tulsa, and I figured it would be a quick fix. Spent about 14 hours over two weeks pulling panels, re-sealing the sump drains, and pressure testing the lines twice with dye and UV light. Turned out the culprit was the tiniest o-ring on the fuel selector valve that only showed a wet spot when the tank was above half full and the plane sat overnight. I felt pretty dumb after all that, but at least the customer's plane is dry now. Anybody got a trick for catching those slow seeps without tearing half the interior apart?
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