Jet pump stopped pumping today and I can't figure out where the issue is!

Plumbing Forums

Help Support Plumbing Forums:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

BigBrosMo2

New Member
Joined
Jan 3, 2023
Messages
2
Reaction score
1
Location
Thailand
My pump came on today and ran about 45min before I realized it wasn't pumping any water. I took it apart and have tested everywhere I can think. I am stumped. 1hp Saer jet pump. Well is 12m deep. Foot valve full submerged.

The problem lays in one of 3 places; 1. The motor, 2. The impeller, or 3. the foot/check valve.

1. The motor. When power applied it turns. No visible burnout or strange noises or anything. If I put pressure on the spinning impeller it keeps turning with resistance so I know it's tight and providing torque.

2. The impeller housing. I cleaned it, the o-ring, everything. No excessive wear anywhere. Nothing appears burned out or melted.

3. The foot valve. When I remove the pump both pipes into the well have water. It doesn't drain out (no air leak, check valve is working). When I blow into the DOWN pipe, water comes out the UP pipe. Ie. Everything seems to be working down there.

If I prime the pump and run it, there's an initial spurt of water ejection (like whatever was in as prime) but then nothing further comes out.

I put the pump on a bench, sealed the bottom of the IN pipe and primed it, then submerged the bottom of the OUT pipe in a bucket of water. Turned it on and it drew from the bucket. I didn't feel any pressure pushing the water to the IN pipe.

This doesn't make sense to me why it worked but it did (maybe because the bucket has no height to worry about).

It just doesn't seem to be pushing the water down the intake pipe. Where do I even begin to diagnose? Sorry with the confusing explanation. It will be a major PIA to pull up the pipe. How do I prove that the foot valve and everything is fine without doing that?
 
If the motor is spinning and not tripping an overload, the motor is fine. If the drop pipes are staying full of water you r foot valve is fine. If the impeller eye isn't melted and pieces shaving off most likely the impeller is fine. Two pipe jet pumps need a ball valve or pressure sustain valve on the discharge line to hold back some pressure to force water down the drive pipe going down the well. If there is no restriction in the discharge line there is not enough flow in the drive pipe to push water up the suction pipe. MOST jet pump problems are caused by a suction leak. Especially after they fail to shut off and get hot. If you have threaded plastic fittings going into the pump they probably got hot and are leaking air in.
 
If the motor is spinning and not tripping an overload, the motor is fine. If the drop pipes are staying full of water you r foot valve is fine. If the impeller eye isn't melted and pieces shaving off most likely the impeller is fine. Two pipe jet pumps need a ball valve or pressure sustain valve on the discharge line to hold back some pressure to force water down the drive pipe going down the well. If there is no restriction in the discharge line there is not enough flow in the drive pipe to push water up the suction pipe. MOST jet pump problems are caused by a suction leak. Especially after they fail to shut off and get hot. If you have threaded plastic fittings going into the pump they probably got hot and are leaking air in.
Thanks for your input. The downpipes were staying full but in the end I removed them and the foot valve was indeed stuck closed in the mud. Problem solved!
 
Back
Top