Regal 2000 ES Owner's Manual page 159

Systems
To gain access to the impeller, the pump must be disassembled
from the bilge pump grate. Simply push the tabs of the grate inward
towards the bilge pump, while simultaneously pulling up on the
bilge pump. is locking mechanism functions much like a quick
disconnect clip. If the fuse for your bilge pump "blows", be sure
to investigate why the bilge pump was drawing too much power.
Likely causes of bilge pump malfunction are debris in the impeller,
bad impeller, debris in the oat switch, bad motor, or short circuit.
Typical Bilge Pump And Automatic Float Switch
4-3