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Self-priming pump self-priming height, and impeller seal clearance, the number of pumps, the level of the separation chamber and other factors. The smaller impeller seal clearance, the greater the self-priming height, generally taken as 0.3 to 0.5 mm; in the gap increases, in addition to self-priming height drop, the pump head, the efficiency is reduced. Pump self-priming height with the impeller circumferential speed u2 increases, but to the maximum height of self-priming, the number of revolutions increased self-priming height will not increase, this time only shorten the self-priming time; when the number of revolutions As you descend, the level of self-priming drops. The self-priming height also increases with increasing reservoir height (but not beyond the optimal reservoir height of the separation chamber), with all other conditions remaining constant. In order to better self-priming pump gas and water mixing, the impeller blades to be less, so that the blade pitch increases; and should be used semi-open impeller (or impeller channel wider impeller), so that more Easy backwater depth into the impeller cascade. Self-priming pumps most of the internal combustion engine and supporting, mounted on a mobile car, suitable for field operations.