I replaced the housing and with about a 2 gallon fill consisting of: Remove cap, pour water in till full, install cap, turn on pump, turn off -refill, cap on turn on......repeated this and after 2 gallons of water poured in it worked and the psi and volume from each spigot is incredible. But each time I went to use the pump it took more and more water to prime. Most recent after the above repeated procedure and 6 gallons total water poured in it never drew water on its own. I have removed the inline copper one way check valve. Its easily replaceable if its bad. What constitutes a bad check valve? I can push the center valve disc- its spring loaded and moves freely. The "Foot Valve" would be another story. My shallow well is in a small shed. How would I lift out the piping to get to the foot valve? Apology for upside down pics.