All my planes have leaked this way intermittently. My first plane, C172 did this before I got it home the first time.
Probably all older planes do this, I would expect. I have had those drain valves replaced on all my planes but they still leak intermittently because, I suppose, any tank and or fuel line over a few years old has some small amount of debris in it (hence the fuel filter near the carb.). The Lake LA4 I bought a few years back is a 1963 model, you can see the finger screen in the tank is clear, and tank bottom is clean. When I got it home I flushed out the low points in the system and got at least a tablespoon of fine particulate crud out from behind the low point drain valves (2 each). That crud was behind the drain/sample valves and was not coming out without some direct intervention. I had to drain the system and refill the tank a few gallons at a time to flush it out. Snaking it with a small-sh size safety wire as a snake. I checked for it because an NTSB report I read (I read all I can find for any new to me model before I fly one) was a fatality take off power failure that had the fuel line blockage problem (crud in the lines) in this model. But all my planes have had this problem to some extent. So making sure it does not weep after taking a sample is an every time thing for me. Also flow rate of the sample matters. If a sample flows at all slow, better to check for blockage before flight. Cheers! Jg > > > >
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