Why is keeping the pump primed important during drafting?

• A. To increase flow rate by raising engine rpm.
• B. To ensure continuous water flow and prevent loss of prime due to air leaks or low suction conditions.
• C. To prevent water from entering the pump during drafting.
• D. To simplify hose management.

Answer: (B)

Drafting relies on creating suction to lift water from a source. The pump must have a continuous water column in the pump and suction hose to develop and sustain that suction. Keeping the pump primed ensures the suction side remains full of water, so air cannot break the seal. If air leaks in or the suction line runs dry, the prime is lost, the pump can’t suck water, and flow stops or becomes erratic due to cavitation. Re-priming is then needed to restore flow.

So the main idea is that a primed pump maintains a continuous water flow by preventing air from entering the suction, which would otherwise break the suction and stop drafting.