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Arrow 3 fuel drip

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Joined
Mar 8, 2017
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I have an arrow 3, runs great.
Due to a medical issue it's been sitting for about 3 weeks.
Just notice a fuel stain mixed in with my oil breather deposits in the coolie sheet that is kept under the airplane.
1 mechanic thinks I have a leak in my fuel pump.
The other mechanic says it's a known issue if the lycoming sits and not to worry about it.
The airplane has never leaked before but the airplane has never sat this much before.
The belly is clean, so it doesn't appear to be leaking in flight.

Thoughts?
 

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