You found it! Can"t have any air going into a opening that big and into the hopper area. you will not have much air coming out of the nozzles. Good find, fix it and you will be make good gases again. Number one problem in most gasifiers a air leak found that is causing the problem. Good job Jan on findind it. The hopper must be air tight for the nozzles to work properly.
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It is such a nice feeling when things you wonder about what the problem is turns out to be a super easy fix 
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I don’t know if this is the cause of the tar though, in any case I was happy to see how much water and tar it was in the tank, last year I had none, so my drum seems to be working.
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