The maximum vertical lift at sea level with a pump in perfect condition is 33.9 feet. A more realistic lift is 20 - 22 vertical feet. A standard centrifugal pump will not prime itself. A gear pump in good condition will prime itself. But, a gear pump is more easily damaged by debris in the liquid than a centrifugal pump.
Some centrifugal trash pumps are self-priming also. In order for a centrifugal, or self-priming pump to attain its initial prime the casing must first be manually primed or filled with liquid. Afterwards, unless it is run dry or drained, a sufficient amount of liquid should remain in the pump to ensure quick priming the next time it is needed. Another type of self priming trash pump is a diaphragm pump.
A centrifugal pump will pump at a higher volume then a gear pump so it is often primed by a gear pump and then the gear pump is shut off and the centrifugal pump takes over. Another way to prime a centrifugal pump is to pour liquid into the pump chamber (casing) while the pump is turning. If the pump is in good condition the pump will pick up a prime and continue to pump. If it doesn't pick up a prime, look for air leaking into the suction hose, or worn pump rings.
If I was going to do what you plan to do, I would use a gear pump with a mesh screen at the end of the suction hose. This solves the need for priming the pump upon startup. Another possibility is a self-priming centrifugal trash pump, but this pump needs to be in very good condition and will need to be primed the first time it is used.
If you want to know more about pumps, google: pump handbook 071503.pmd
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