Hello dear agricultural machinery mechanic, I have the following problem, dealing with lawn mower Swing 40B with the standard carburetor In cold condition after 3x pumps the lawn mower starts immediately, runs round and runs out after ~5min, afterwards after repeated pulling does not start again. If I again 3-5 times pump then it starts again without problems, runs for a few minutes and goes out again just as wrinkling. Carburetor I have cleaned several times with carburetor cleaner, inlet tube and V Entile cleaned, soot freed, tank completely cleaned. Seal under the carburettor as new. Even when buying it was not as clean as now! Why is no gasoline mixture sucked in automatically? How could I check that?