Why is my Whale Gulper 320 pump not sucking properly?

Question

Accepted Answer

If your Whale Gulper 320 pump is running but not sucking properly, here are the checks to perform:

1. Connection and Sealing

Check that the inlet hose is properly connected and that the fitting is not leaking
Ensure that the outlet hose is not blocked or crushed
For proper priming, the suction hose must be airtight

2. Mounting Position

If you have mounted the pump vertically, make sure the pump head is at the lowest point
The pump can operate horizontally or vertically, but the position affects priming

3. Damaged Diaphragm

If the diaphragm (membrane) is worn or punctured, the pump loses its suction capacity. This can wear out over time, especially if you frequently pump wastewater. A complete maintenance kit (Part No. AK1550) contains the necessary replacement parts.

4. Check Valve

The internal check valve may be dirty or stuck, especially after a period of inactivity
Run the pump for a few seconds: this may dislodge deposits

If after these checks the problem persists, the diaphragm or internal check valves will likely need to be replaced with the AK1550 kit.

User manual Whale : user manuals and guides in PDF

Models Whale most viewed

Browse manuals Whale by appliance type

Recent questions about devices Whale