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W203. sometimes stalls. at idle. or with a small amount of fuel, at low speeds stalls due to lack of fuel pressure. pressure disappears due to air. air is captured from the tank. air instead of fuel is captured from the right half of the tank. it dries quickly because the return flow of fuel is special. the flow weakens because the booster pump next to the injection pump dies. I think it should supply the engine and send a flow back.