D
davidhillAug 21, 2025
How to fix a Graco Water Pump that cycles but won't prime?
- MMichael WilliamsAug 21, 2025
If your Graco Water Pump cycles but won't prime, first try reducing the air inlet pressure, as the pump might be running too fast, causing cavitation. Also, inspect the check valve ball for wear or obstructions and replace the ball and seat if necessary. Check the seat for wear and replace the ball and seat. Ensure that the outlet and inlet are not clogged; unclog them if necessary. Make sure the inlet and outlet valves are open, and tighten any loose inlet fittings or manifolds. Replace any damaged manifold o-rings.