I don't see any dirt in the filter and it is full. It wasn't always full before. I was running it with a rubber fuel hose sticking in a antifreeze jug full of fresh gas and the in-line filter never appeared full. Since it is full now, it would make you think that the inlet port of the carb might be clogged, OR it can't get enough pressure through the fuel pump to push what's in the full filter into the carb?