Water Pump Losing Pressure
My water pump (3/4 HP), which is at least 5-10 year old has lost the ability to retain pressure. I thought it might be the pressure tank, however, I turned off the feed from the pump to the pressure tank and it still lost pressure. This makes me believe that the pump is the problem. I draw water approx. 20ft to the head, from a fresh water lake. I would appreciate any assistance as a replacement pump is approx $400. Can the pump be repaired (i.e. seals replaced). I am guessing the pump will last a few more days before it ends up burning out as it cycles every 1-2 minutes to keep pressure.
Is there a chance it is a vaulty check valve, and if so how can you open the pump and replace it? I am a backyard mechanic that know little and is willing to learn. I read in a similar post, that a check valve and foot valve are the same thing. Considering the foot valve is probably 20 ft down in the lake, is there a way I can test this, or are my symptoms of losing pressure (with the pressure tank shut off - house cut off from pump) a easy sign of a replacement?
Consider I am pulling from a lake is there a chance some sand/silt has gotten between a seal somewhere, and finally, are these pumps worth fixing (are they serviceable)?
I really appreciate the help from the experts.
Comment on pinkpanthernot's post
Good answers and should be looked at but also if you are pulling water from a lake a good chance the foot valve(check valve) is dirty or clogged with grass or other matter. Pull it off, clean it and try again. Let us know. Good luck.