Model #390251801 CRAFTSMAN Pump

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Hydroglas pump loses prime 390251801 Craftsman Pump


Thank You for choosing Sears It is unfortunate to hear that you are having issues with your pump and do understand your frustration. Glad to help out. Im looking at your model number 390251801 and if the motor runs but no water is delivered*(Note: Check prime before looking for other causes. Unscrew priming plug and see if there is water in priming hole.)

Possible causes: 
1. Pump in a new installation did not pick up prime through: a. Improper priming b. Air leaks c. Leaking foot valve *2. Pump has lost its prime through: a. Air leaks b. Water level below suction of pump 3. Impeller is plugged 4. Check valve or foot valve is stuck in closed position 5. Pipes are frozen 6. Foot valve and/or strainer are buried in sand or mud. 

Corrective action: 
In installation already in Use:
a. Check all connections on suction line and
shaft seal
b. Lower suction line into water and re-prime. If receding water level in well exceeds suction lift, a deep well pump is needed. Clean impeller; see Maintenance
Replace check valve or foot valve.
Thaw pipes. Bury pipes below frost line. Heat pit or pump house. Raise foot valve and/or strainer above well bottom. Here is a link for the owners manual for more information page 12. I hope this informatoin helps with your troubleshooting.  Just click the blue link above to be taken to the page. If you have further questions please resubmit your question for further information.
Thank you for choosing Sears

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Sherman_G_Wallace -
Sears Technician
July 10, 2014

craftsman pump leak


I can understand how important this would be to have working right. While you are waiting for your expert answer, I would suggest you go to There you will find the diagrams for the pump. It will show you how to get to the o ring. It can be a complicated repair, so if you don't feel comfortable, then you may want to get a techincan to look at it. I hope this helps.

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aashe -
July 14, 2011

Replacing the O-ring on the pump body is not a hard task to complete at all. If you're comfortable enough to try and tighten the clamp as you did then you should have no problem with replacing the O-ring. Once you have the 2 pieces of the pump housing apart and the old O-ring out of the way, clean out the groove where the ring sits. Once the groove is clean, apply a thin layer of food grade silicone grease in the groove on both sides of the pump housing then install the new O-ring.

It's really not a hard job, but if you run into any issues with it just swing back and let me know.

The O-ring is part number U0-399 and may be ordered HERE .

Thank you for using Manage My Life!

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XX Wade_ -
Sears Technician
July 15, 2011
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