Honda WD20X Owner's Manual page 28

When the pump does not pump water:
1. Is the pump fully primed?
2. Is the strainer clogged?
3. Are the suction hose bands installed securely?
4. Is the suction hose connector washer installed?
5. Is the suction hose damaged?
6. Is the suction head too high?
7. If the pump still does not operate, take the pump to an authorized Honda
water pump dealer.
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