Pump Loses Prime: Could it be the shaft seal?

garin33

Active member
Nov 9, 2020
27
Los Angeles, CA
Well, it would seem that the plastic is getting sucked in for it to tear. Its blocking the leak enough to at least get a partial prime going. If you have duct tape you could try a couple of rounds of that to tape the lid to the pump pot and see if the pot fills completely. If that works then I would replace the pump pot.
Thank you. Let me try it again. It was a little awkward so I'll try to take more time. I appreciate the help from everyone. Will post back after I try to seal.
 

generessler

Active member
Dec 13, 2020
29
Chapel Hill, North Carolina
It sounds like you're on the right track. I'm no expert, but have the same pump.

Had a problem with lid O-rings ordered from Amazon including ones marked Pentair OEM. They were just a bit thinner than the original. Pump drew air. Went back to the original ring and all fine again. Finally found good replacements.

Maybe you got some of the bad ones? Since it sucked a hole in the plastic, there must be air getting to it just as zea3 said.
 

garin33

Active member
Nov 9, 2020
27
Los Angeles, CA
Well, it would seem that the plastic is getting sucked in for it to tear. Its blocking the leak enough to at least get a partial prime going. If you have duct tape you could try a couple of rounds of that to tape the lid to the pump pot and see if the pot fills completely. If that works then I would replace the pump pot.
ok, I feel pretty stupid but I realize now that I wasn't sealing it the way you mentioned. I was trying to seal it with the plastic between the cover and the pot, the way you seal canned goods with wax paper. I realized it when you mentioned the duct tape. Geesh. Anyway, I have some stretch wrap that we use here to wrap pallets so I will try that tonight or this weekend. Thank you.
 

garin33

Active member
Nov 9, 2020
27
Los Angeles, CA
It sounds like you're on the right track. I'm no expert, but have the same pump.

Had a problem with lid O-rings ordered from Amazon including ones marked Pentair OEM. They were just a bit thinner than the original. Pump drew air. Went back to the original ring and all fine again. Finally found good replacements.

Maybe you got some of the bad ones? Since it sucked a hole in the plastic, there must be air getting to it just as zea3 said.
Thank you. I did try switching it with 2 other pump lids that are working fine but maybe this pump is more sensitive due to the elevation, etc. But I will try another O ring. I realize now that I was not sealing it properly with the plastic. I was putting the plastic between the lid and pot and tightening the lid down. Like sealing a jar. Duh, I know, pretty stupid. I will try wrapping it on the outside with some stretch wrap we use for pallets. Thank you for your comments.
 

garin33

Active member
Nov 9, 2020
27
Los Angeles, CA
Hello. I just wanted to follow up in regards to trying to seal the pump lid with plastic wrap. It's really difficult trying to seal the lid with the plastic wrap to the pump pot. It's hard to explain but the rim of the pot is very narrow and the way the lid fits on, there is no surface area to wrap the plastic wrap on. I tried to do it anyway but it made no difference but I don't think it was really sealing it. So when my pool guy returns from his vacation, I am going to have him swap the pump I am currently using for the spa with this pump. Both are the exact same pump and the other pump is working fine so at least I will know if the problem is the pump or possibly something else without a lot of expense. What a nightmare this has been. Thanks for everyone's suggestions and I'll update in a few weeks when I switch pumps.