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Ron,
As stated above, it is a demand system. Since it is a demand system with all the faucets closed the pump is trying to pull liquid up and compress the air giving you the cavitation.
Open a faucet or the low point to relieve the blockage on the output side of the pump and it will pick up prime. I have the same problem when pulling water out of the holding tank. Since you are pumping in antifreeze I would just open a faucet. That way it goes in the pipes and or the drain trap.
The 4' hose should work just fine. I use the blue coiled hose.
Let us know what you find.
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