Fujika Water Pump Question

[patekatek]

I have a Fujika water pump that is about 12 years old.  Now, on occasion, the pump will turn on but there is no water output.  A couple times a light tap make it pump water and a few other times I unscrewed the cap on top and let some water flow out, replaced the cap and the pump worked as normal.  I guess my question would be, is the pressure switch or pressure tank the most likely to be at fault?

 

Thanks, in advance for any helpful suggestions.

 

 

[VocalNeal]

The non return valve. In theory under the other cap you didn't take off. 

The water is draining back and the pump is not primed when it starts.

 

 

 

 

On a Mitsubishi pump there is a spring that holds the non-return valve down. Available at any store that displays water pumps. In your case you may be able to get one direct from Fujika Thailand.

Your valve maybe simply stuck. 

[carlyai]

Maybe the impeller or the impeller body is worn.

12 years already is good. 

Try and buy the same new pump, so you can use the old one for spares.

 

 

[patekatek]

I just checked out the pressure tank.  It was full of water and there was no air released when I pressed down on the stem for putting air in the tank.  I tried using a bike tire pump to add air but it wouldn't take any air.   Also, I might have described the problem a bit wrong in the OP.  When I turn on the water, the pump whines......for 10-15 seconds then kicks in.  However, not all the time.  As I mentioned in the OP, I've had to loosen the large cap on top (water supply intake), let some water run out, then re-tighten the cap.  Maybe it is time for a replacement pump.