A pump no longer sucks - Measures

A pump no longer sucks - Measures


A pump that does not draw water does not necessarily have to be broken. Sometimes there are only minor faults that can be easily remedied.

Differences between different pumps

In domestic waterworks and as garden pumps, two different pump types are used: suction and submersible pumps. If the pump is located in the bottom of the water and pushes it upwards, it is a submersible pump. Models that are above the water and suck it up are suction pumps. Hand-operated rotary pumps are in the latter category.

Self-priming suction pumps are installed in most domestic water systems. These are able to initially promote air and suck in this way the water. The process is similar to vacuuming on a drinking straw.

In order to prevent the sucked-in water from falling back when the pump is switched off or at the next stroke, a non-return valve is installed in the system. This is required for all suction pumps.

Causes if no water is pumped

Each pump has a maximum delivery height. If this is exceeded, it sucks, but it does not promote water. If this cause is to be excluded, clogged filters or air in the suction line as a possible reason in question. Somewhat rarer are defective check valves. The mentioned malfunctions occur with all pumps.

At Rammbrunnen the Rammspitze protrudes into the water-bearing layer. It is surrounded directly by the soil. These wells tend to silt at higher flow rates. They are only suitable for rotary pumps and other hand pumps. An electric garden pump sucks more water and thus mud. The filter on the pipe closes and clogs. The pump can no longer deliver water. In addition, motor pumps suck the well quickly empty, they promote only when water has seeped. This is not a fault but a normal process.

Small cause big effect, the seal is important

A suction pump must create a vacuum in the suction line. If the pump is not absolutely tightly connected to the pipe, it can not suck in water. The only reasonable sealing material for the screw connections is Teflon tape. Hemp is not suitable for these gaskets.

If the device does not suck despite tight screw connections

Usually there is another leak. Unless water leaks at the pump at any point, the seals are likely to be OK. The suction lines can be easily checked by filling them with water and placing them in a large drum of water. The pump is mounted at the level of the barrel. It now promotes water. It is now lifted into the air, the hose rises out of the water. Now it is easy to see where it is porous and sucks air.

A leaking hose is easy to replace, otherwise replace the seals on the pump. If that does not help, the system will need a new check valve.

The repair is almost always worth it

If a motorized garden pump or the pump runs on the house water system but does not deliver water, the engine is OK. Only a replacement of hoses, gaskets or a valve is required. The quite simply constructed rotary pumps can be repaired cheaply in any case.



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