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The application relates to a detection mechanism, method, device and system of a fuel evaporation system, wherein the detection mechanism of the fuel evaporation system comprises a carbon tank, a valve part and a vane pump which are communicated with the carbon tank respectively; the valve part is provided with an intake manifold communication port and a fuel tank communication port; the vane pump comprises an impeller and a rotating speed sensor which is used for detecting the rotating speed of the impeller. The detection mechanism of the fuel evaporation system can improve the leakage detection efficiency of the fuel evaporation system, simplify the overall structure and improve the detection accuracy.