Some rotary pumps are self-priming when dry. These pumps have a priming chamber that automatically does the self-priming when the pump is not in use. To prime a pump yourself, the priming plug should be removed. Water should then be poured into the pump. The entire priming process should take no longer than five minutes. If it takes longer than that, it could be indicative of a mechanical problem.

Priming of any pump is the same - it means filling the pump with liquid to get it to pump because the pump will not fill itself with liquid from being dry (it won't self-prime).

The fuel pump requires no priming.

It didn't.

Pump priming