According to herlihyboy :

Will the pump lose it's prime? If so, what will I need to do to
reprime it after the repair? The instruction manual has info on
filling the pump with a garden hose, but I don't think that's easily
possible, now, as the system is PVC'd together.

There's a good chance it will lose its prime. Depending on how
good the foot valve is and how long you take to fix it.

Most (all?) pumps have threaded holes in the pump housing.
One will usually be "occupied" by the fitting to the pressure switch.

The others will be "occupied" by plugs - usually with square heads.
Find a suitable upwards facing plug, remove it, and fill with
water via a funnel.

Jet pumps can sometimes be difficult to prime. Depends on how high
a head the pump has to raise.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.