Hyundai 1 inch Owner's Manual page 21

Use the commercial hose available and the hose connector and the hose clamp
provided with the pump to install the discharge hose., then tighten the clamp.
Firmly, fix the discharge hose so it doesn't move.
For best results use a short, large-diameter hose as it will reduce fluid friction
and improve the pump output.
Tighten the hose clamp securely to prevent the discharge hose from
disconnecting under a high pressure.
5) Priming the Pump
Before starting the engine, fill the pump with water. Unscrew the priming plug
and fill the pump full with clean water. Do not unscrew the priming plug during
operation of the water pump. After priming, reinstall the priming plug and
tighten.
Dry operating of the water pump will damage the pump seal. If the pump has
been operated in a dry state, stop the engine immediately and allow it to cool
before being primed.
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