pump losing its prime

I have a shallow well (21'). My old pump was constantly cycling, so I replaced the pressure switch. That didn't cure it, so I installed a cut off valve on my line in, while I was at it, I figured I may as well replace the pump with a new one, which I did. 1 HP. Now the cycling problem stopped, buttt now I have a problem of my pump losing its prime. I have a 30/50 pressure switch in this. There are no air leaks in the system from my install. Any suggestions or help in this? This is a inside, above ground pump with a pressure tank, which by the way is NOT water logged. I set pressure in the tank to 28 psi prior to firing it all up.
Thanks, Joe

How do you know there are no air leaks? You can't see them. What horsepower was the old pump? What kind and size of tank do you have?

bob...

Did you happen to replace the footvalve while you were installing the new pump?
Ron

OK no air leaks on all the visible pipes, which are above ground inside house. I replaced the old 1 hp pump with a new 1 hp pump. I haven't been able to replace the foot valve, due to me not knowing where the well is actually at on the property. I am guessing that it might be the main source of the problem. Is there a way to clean out the foot valve somehow, either by forcing air down there or do I actually have to find my well and take it from there?

Also, is there a some what easy way to adjust the pressure switch, it seems that the pressure kicks on at about 26 PSI and off at 52 PSI. I know its a 30/50 switch on the unit. The are "2" adjust ment nuts on the switch, a large one and a small one. Thanks

I'd guess that the footvalve was your problem all along. Unfortunately, you'll need to locate the well to replace the footvalve.
The taller of the two springs will adjust both the cutin and cutout pressures. The shorter will adjust the cutout only.
Ron