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Thread: pressure issues

  1. #1
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    pressure issues

    Need a little assistance here. I have a 30 gallon pressure tank(I think) a submersible pump and the switch is set to 20/40. I got the pressure in tank to 18#.

    The problem is when the pump shuts off and the water is still running, the pressure will slowly drop to about 20, then suddenly drop to 0 and the faucets stop. After 30 seconds the pump will turn back on and return pressure to 40# and turn off.

    I've noticed that it mostly happens when using one particular bathtub. I'll double check the system by using other faucets in the house, but I don't understand how a particular tub would be the problem. Unless its some sort of low pressure cut off. I thought it was the pressure switch so I changed the pressure switch today, and everything was working fine until once again using that bathtub.

    I'll have to check the new switch to make sure its still doing its job and didnt fry due to some electrical issue. Could possibly be related to lightning here too. Lightnight hit nearby and I saw a spark jump in between the washer and dryer. This was a while ago, about 2 months, and at the time I didn't notice any problems with the water.

    I've been at this for days. Any help would be greatly appreciated.

    Thanks,
    Brandon

  2. #2
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    quote:Originally posted by Brandon607

    Need a little assistance here. I have a 30 gallon pressure tank(I think) a submersible pump and the switch is set to 20/40. I got the pressure in tank to 18#.

    The problem is when the pump shuts off and the water is still running, the pressure will slowly drop to about 20, then suddenly drop to 0 and the faucets stop. After 30 seconds the pump will turn back on and return pressure to 40# and turn off.

    I've noticed that it mostly happens when using one particular bathtub. I'll double check the system by using other faucets in the house, but I don't understand how a particular tub would be the problem. Unless its some sort of low pressure cut off. I thought it was the pressure switch so I changed the pressure switch today, and everything was working fine until once again using that bathtub.

    I'll have to check the new switch to make sure its still doing its job and didnt fry due to some electrical issue. Could possibly be related to lightning here too. Lightnight hit nearby and I saw a spark jump in between the washer and dryer. This was a while ago, about 2 months, and at the time I didn't notice any problems with the water.

    I've been at this for days. Any help would be greatly appreciated.

    Thanks,
    Brandon
    I had a pump once drove me crazy!!! In the end, it had been hit by lighting and it took about two weeks to totally die. The good news is, this will be covered under your home owner's insurance. You will have to have a driller pull the pump and document. I always cover the decidable, so ask the drill about that.[8D][8D][8D]

  3. #3
    Pump guy speedbump's Avatar
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    You said the tank pressure was 18. I assume you know you can only check that pressure with the pump off and all pressure let out of the plumbing.

    I have a feeling the piping feeding water to your pressure switch is mostly plugged and the switch can't react quickly enough to turn the pump on before the tanks bladder hits bottom and all water is gone from it. AT that point, the pressure goes from 18 to zero because there is no more water in the tank to be pushed out by the remaining 18 psi in the tank.

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  4. #4
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    Thanks a lot you guys for helping.

    I checked the small tube going to the pressure switch. It seems ok. Speedbump was right about there not being any water in the tank. I was wondering about that. Shouldn't the tank fill up atleast a few gallons? If so, how does it fill?

    I turned off pump and drained all pressure. With the power supply off, at around 20# it dropped down to 0. I then Checked the tank and its at 18#. Turned pump back on and it only filled to about 25# before the switch engaged and turned the pump off.

    With that, I will now go and make sure the factory settings of 20/40 are right.

    Any ideas are appreciated.

    Thanks,
    Brandon

  5. #5
    Pump guy speedbump's Avatar
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    The two readings of 20 and 18 tell me your gauges are two pounds different. That is common with cheap gauges.

    You didn't mention the brand of tank, but most bladder tanks fill and empty from the bottom. Once the bladder is empty, your system pressure is zero. This is when you check the tank pressure.

    If the pump only went to 25 lbs, your switch is all out of whack. It should be 20/40 with the 18 pound precharge. Personally I prefer 50/70. I like stinging showers.

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  6. #6
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    Ok, I fooled around a little bit more and noticed something. I adjusted the pressure switch slightly. Whats happening is when the pump reaches 35# it shuts off. The pump does, not the switch. The switch contacts are still touching, but no pump. If I try to manually trip the switch, theres nothing.

    I'm guessing I have a couple problems. The pressure in the tank and having no water in it, and second that damn lightning may have killed the pump.

    What do you guys think?


  7. #7
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    quote:Originally posted by Brandon607

    Ok, I fooled around a little bit more and noticed something. I adjusted the pressure switch slightly. Whats happening is when the pump reaches 35# it shuts off. The pump does, not the switch. The switch contacts are still touching, but no pump. If I try to manually trip the switch, theres nothing.

    I'm guessing I have a couple problems. The pressure in the tank and having no water in it, and second that damn lightning may have killed the pump.

    What do you guys think?

    I still think lighting killed the pump. Call a driller and your insurance company.

  8. #8
    Pump guy speedbump's Avatar
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    If the points are in fact passing voltage through to the pump and it's the proper voltage, it's the pump. Or at least the thermal overload. If that's the case, the pump should not sound normal. The motor should sound strange compared to how it used to sound. Or is this a submersible pump?

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  9. #9
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    quote:Originally posted by speedbump

    If the points are in fact passing voltage through to the pump and it's the proper voltage, it's the pump. Or at least the thermal overload. If that's the case, the pump should not sound normal. The motor should sound strange compared to how it used to sound. Or is this a submersible pump?

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    As I read it, it is a submersible. I went thought the same thing with one. I would go there and pick up the drop and it would pump fine, then in a few days it would pump very little water. Finely I just changed it. The pump suppler said it was a lighting hit.

  10. #10
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    Yes it is a submersible. Looks like it might be time to pull it up unfortunately. Unless theres a way to test the pump from above ground.

    Thanks again guys. It gets frustrating at times.

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