The present invention relates to a method of operating a conveying and metering system for a reducing agent solution of one or more SCR catalytic converters of an internal combustion engine, wherein the conveying and metering system comprises: at least one transfer pump; One or more resuction pumps; One hydraulic supply line; And a plurality of metering supply valves connected to the hydraulic supply line. After the shutdown of the internal combustion engine, a resuction 82 of reducing agent from at least the parts of the conveying and metering system is carried out while the metering supply valves are shut off. Subsequently, all metering supply valves are open at the same time (84).
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