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Self-priming automatic electric pumps with helical gears, produced by Marco.

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The pump is running but no water

The pump is running but there is no water

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Prime the pump

Priming Tips

  1. Place the pump as close to the water source as possible. ...
  2. Fill the pump case completely with water (Never operate a centrifugal pump without water in the pump casing)
  3. Start the pump engine.
  4. By partially restricting the discharge hose, priming time can be improved.

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From the day that I installed the UP6/E it was difficult to get it to prime, even when I was just switching tanks. I kept relocating the pump lower towards the water tanks. I checked for suction leaks and even replaced hoses.

I eventually found that the check valve on the pickup side of the pump was bad. It had a tear in the plastic body of the valve that kept it from preventing back flow. I have not found a source for a replacement valve, but I folded the plastic piece back together and reinstalled it.

It primed in mere seconds for the first time since I owned it (5 years about).

You can find the check valve right in line with the water supply line where it hooks up to the pump. You’ll notice that this hookup looks slightly longer than the discharge hookup on the other side. That’s because the water supply side is made up of two parts. Take off the two parts and unscrew the two parts to find the check valve. It might just be jammed in the open position or deformed or damaged. My valve was a pain to get out due to water scale buildup. It’s probably best to get the pump on a well lighted, clean workbench right off the bat.

Update (09/15/2020)

Block Image

Block Image

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Hi @tenakeetom ,

If I'm reading it correctly there is no replacement valve available. It doesn't even rate a mention in the parts diagram (see p.11) unless it is considered a part of the pump body (part #1), so it's a good thing that you managed to fix it.

Cheers.

さんによる

Correct, I haven’t found a replacement check valve. I noticed that the check valve is not shown on the parts breakdown diagram. The check valve is housed in the pump body, so maybe I would get a check valve included if I ordered the pump body.

Why dont they show the parts numbers in the parts diagram ?

I also need the shaft seal that keeps water from exiting the pump section and entering the electric motor. Water is getting inside the motor.

さんによる

The “new” parts breakdown schematic now shows the check valve! I’ll try and post a screenshot. And, of course, they don’t show a part number. I have an email in to the company, and am waiting for an answer.

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erikd148 さん、ありがとうございました!
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