Fresh water

[Dingus6772]

So when my fresh water gets half full the water pump acts like it's empty.

 

[Buly]

I’m guessing, the pump can not prime itself when the water level drops. How is the mounting level of the pump, compared to the tank? Higher or lower from the tank?

 

[Dingus6772]

I’m guessing, the pump can not prime itself when the water level drops. How is the mounting level of the pump, compared to the tank? Higher or lower from the tank?

Thanks @Buly
The pump has been replaced recently and that makes perfect sense. I'm wondering if there's a replacement pump that's low profile and doesn't need a prime. Thanks again

 

[Dingus6772]

I’m guessing, the pump can not prime itself when the water level drops. How is the mounting level of the pump, compared to the tank? Higher or lower from the tank?

That makes perfect sense. I've replaced the pump recently. I'm guessing I need a low profile pump, possibly one that doesn't need to be primed. Thanks so much.

 

[Dingus6772]

I’m guessing, the pump can not prime itself when the water level drops. How is the mounting level of the pump, compared to the tank? Higher or lower from the tank?

Thanks @Buly
The pump has been replaced recently and that makes perfect sense. I'm wondering if there's a replacement pump that's low profile and doesn't need a prime. Thanks again

Thanks @Buly
The pump has been replaced recently and that makes perfect sense. I'm wondering if there's a replacement pump that's low profile and doesn't need a prime. Thanks again

 

[Buly]

If there is room for you to mount the pump lower than the tank, it will help. Then the pump will not need to prime since there always will be a some water on the intake side.
All pumps should be able to self prime to some degree. Maybe the new pump has something wrong with it?

 

[Dingus6772]

Well it is a new pump and I cannot mount it any lower and I cannot raise the tank. Is there a different kind of pump you can suggest?

 

[Bob K4TAX]

Well it is a new pump and I cannot mount it any lower and I cannot raise the tank. Is there a different kind of pump you can suggest?

Nothing said that a "new" pump is not defective. After all, it is only new, which is not necessarily evidence of it being good.

Also, make sure there are no air leaks on the intake side of the pump. And make sure the tank vent is not obstructed. Otherwise, the pump will be pulling a vacuum on the tank and at some point, won't pump water.

 

[Dingus6772]

Nothing said that a "new" pump is not defective. After all, it is only new, which is not necessarily evidence of it being good.

Also, make sure there are no air leaks on the intake side of the pump. And make sure the tank vent is not obstructed. Otherwise, the pump will be pulling a vacuum on the tank and at some point, won't pump water.

Gotcha, thank you very much

 

[Gronk]

Chances are it is like another trailer that I had. The tank was about 8 inches deep, the inlet (gravity) was on the side and the pump suction was on the side also. I calculated the 'loss' due to where the fittings were and it amounted to almost half the tank capacity. You need to see where the pump suction line is and see how close to the bottom it is. Also, verify the sensors are sensing correctly. What is the capacity of the tank?

 

[Dingus6772]

Chances are it is like another trailer that I had. The tank was about 8 inches deep, the inlet (gravity) was on the side and the pump suction was on the side also. I calculated the 'loss' due to where the fittings were and it amounted to almost half the tank capacity. You need to see where the pump suction line is and see how close to the bottom it is. Also, verify the sensors are sensing correctly. What is the capacity of the tank?

The pump is on the same side as the suction line and the sensors are reading correctly. The tank is approximately 50 to 60 ish gallons. Every since I changed the pump it's been doing this. I figured my wife was using to much water and didn't think anything of it. The sensors say it's half full and I usually drain it before I store it and noticed it was half full

 

[Dingus6772]

The pump is on the same side as the suction line and the sensors are reading correctly. The tank is approximately 50 to 60 ish gallons. Every since I changed the pump it's been doing this. I figured my wife was using to much water and didn't think anything of it. The sensors say it's half full and I usually drain it before I store it and noticed it was half full

Thanks @Gronk

 

[Dingus6772]

Thanks @Gronk

I could tell it was half full because once I opened to drain, 25 gallons spilt out

 

[Gronk]

Well, since this started after the new pump, then you need to look at the installation. Sounds like there is an air leak on the suction line that the pump can't overcome after half tank. Either that or the pump itself has an air leak and/or is faulty.

 

[Dingus6772]

I bought the RV used and it had been sitting awhile and the pump wasn't working so I replaced. I will look at what you suggested. I really appreciate your advice. Thanks a bunch

 

[Gronk]

That changes things a little more. Now you are going to have to inspect the whole line from the tank to the pump. Hopefully it won't be terrible hard to do.

 

[Dingus6772]

Ok, gotcha. I got this! Thanks