[well.newbie]

I just installed a shallow well for irrigation. The well is 30' deep and i get water at 18'. Running one hose with open no more than 3/4 it has fine pressure, if i open it fully then the water pressure drops and the gauge drops to about 2psi. It never loses prime for i can close the bib and it will jump back up.

 

[joecaption]

Need more info on what pump your using, what size lines, is there a pressure tank, ECT.

 

[joed]

If the GPH (gallons per hour) of the pump is less than the GPH of water used the pressure will drop.
Also check the water level in the well when the pump has been running. It be dropping too low.

 

[well.newbie]

It it a 3/4 (hp) with a 5 gallon pressure tank, 1 1/4" well pipe reduced to 1" after the check valve. The specifics of the pump is 920 gph, 98' head lift, 26' suction head lift...the pump never loses prime, just when opening the hose fully it sounds like the pump starts cavitating until i close it some then its ok, just not full pressure..it took 2min 13sec, to fill 5gallons

 

[joed]

You need to check the water level in the well when the pump is running.

 

[SHEPLMBR]

pump could be too powerful for what the well recovers. Sometimes bigger isn't always better.