underneath just behind the drivers door!
just found out that the 182's have the fuel filter inside the tank, and indeed they should be changed at 150 k. problem is, I have an external one, near the fuel tank, similar or even identical to the ones found on ph1 172's
pic in this thread:
http://www.cliosport.net/forum/showthread.php?426561-182-Fuel-Filter
it seems like I'm not the only one with this