Well pump issues?

[duckz569]

So my dad and I replaced my old pump and pipes. We dug out a hole deep enough for the water table and it's at least 30ft down. We had no issues with the pump running as normal and doing what it's supposed to do. Ran into an issue about 2 months later with the pump making a noise like there wasn't enough current running to the pump and it would switch off. So I redid all the wiring with no luck and kept having the issue, so then I decided to replace the pump which is an Everbilt 3/4 jet pump. I put it all back together and had no issues. But then the 3rd day when it went to start up all it sounded like it was sucking air or not being able to suck water. I tried different troubleshooting by removing the pump and pipe to make sure the foot valve was still working fine and it was. So put it all back together, reprimed it and all was fine for the first startup, after about a hour or 2 the pump kicked on and it wasn't sucking any water. So decided to try an experiment by keeping the water running in the tub and it would kick on about every 20 mins no problem and fill like normal... But if it sat longer than the 20 mins it wouldn't pull any water and just run.
So at this point I'm lost and not sure what else to do, if any further info is needed I can provide it.

Thanks!

 

[Valveman]

Sounds like you have a check valve and a foot valve. The check valve is keeping the foot valve from working and causing a lose of prime. Remove the check valve as the foot valve is all that is needed.

 

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[duckz569]

Thanks for the reply. I did forget to mention that it is a sand point, guess I was unfamiliar with it and not sure if it came with a foot valve or not. It's easy to remove the check valve so should I do that first and see if that solves the issue?

 

[Valveman]

You can't have a foot valve with a sand point. There should be a check valve as close to the sand point well head as possible. That being said, now I think you have a leak prior to the check valve and above the water level in the well.

 

[duckz569]

Alright, so just for some clarification since I'm new to a lot of this and I pretty much know why it's needed, but what's the advantage to having the check valve close to the sand point? The only downside I'm seeing is if there's a leak above the check valve for whatever reason would that still cause a lot of issues?
Also what do you recommend the best way to drive down the pipe and to prevent it from coming loose? What we did was use a post driver and twisted the pipe tight after each hit to make sure it didn't come loose and what pipe dope do you recommend?