Today I noticed smell of gas as I worked on optimizing the distributor timing curve. Was not hard to find the cause, the big fitting at the Q-Jet inlet, where the paper filter sits in, slowly dripped fuel. The gas line fitting was dry. After disassembly of the large fitting I wondered how this thing is supposed to seal. The threads are interrupted by a number of notches/grooves (blue arrows), making it difficult to seal with teflon tape and the like. And then there is also a red colored paper seal (green arrow), is this doing the sealing task? So how do I properly seal this? Do's and dont's, every hint is welcome. Thanks!