DekDaeng Posted March 1, 2020 Share Posted March 1, 2020 I have a 'Forerun' brand 550 watt pump, which just refuses to prime. In spite supposedly being able to provide 8 m suction, even if I prime it with 8 m head! (i.e. from the top of my 3 story shophouse) it still refuses to pump! I have had it working intermittently, (from a large bucket) but when I place it 'in line' - it just sits and spins - as you can see in the vid. Previous pump was a 250 watt fujika, which had ok performance, so 550 SHOULD be great for my place & roof garden Grateful for any suggestions - Thanks, Deks IMG_3217.MOV \ Link to comment Share on other sites More sharing options...
cornishcarlos Posted March 1, 2020 Share Posted March 1, 2020 (edited) 6 minutes ago, DekDaeng said: even if I prime it with 8 m head! Maybe there is a one way valve on your pump outlet side ?? You need to ensure there is no air in the suction side and no possible way for air to enter whilst running. (that large screw connection would be a good starting point) Edited March 1, 2020 by cornishcarlos 1 Link to comment Share on other sites More sharing options...
bankruatsteve Posted March 1, 2020 Share Posted March 1, 2020 Is there valve on the pump input side and is it open? I couldn't play your video but if you're just pumping air, that's usually the cause. Link to comment Share on other sites More sharing options...
Crossy Posted March 1, 2020 Share Posted March 1, 2020 Are you actually getting prime into the suction tube? Foot valve on the suction OK? Our one fairly long suction has a blanking cap on a T, fill it with water from the hose, an awful lot of air in those pipes to come bubbling out. Link to comment Share on other sites More sharing options...
gaztop08 Posted March 1, 2020 Share Posted March 1, 2020 I couldn’t get your vid to play either on my iPad.Maybe you could try putting vid on YouTube and putting link here if you still have problem. Link to comment Share on other sites More sharing options...
farmerjo Posted March 1, 2020 Share Posted March 1, 2020 Highly unlikely but you checked motor rotation. Link to comment Share on other sites More sharing options...
DekDaeng Posted March 5, 2020 Author Share Posted March 5, 2020 (edited) Have found a temp solution - connected to town water, with positive pressure at intake, pump will start pumping, with a good output. But neither orig or new pump will start, w/o. ??? Thanks for your suggestions - Edited March 5, 2020 by DekDaeng Link to comment Share on other sites More sharing options...
Crossy Posted March 5, 2020 Share Posted March 5, 2020 Is the foot valve serviceable / obstructed (not closing)? Possible air leak on the suction side? 1 Link to comment Share on other sites More sharing options...
farmerjo Posted March 5, 2020 Share Posted March 5, 2020 (edited) Edit Is it the MKP 60-1 model Edited March 5, 2020 by farmerjo Link to comment Share on other sites More sharing options...
farmerjo Posted March 5, 2020 Share Posted March 5, 2020 40 minutes ago, farmerjo said: Edit Is it the MKP 60-1 model https://wpscr.com/index.php/productos/sistemas-de-bombeo/bombas-horizontales?format=raw&task=download&fid=221 Link to comment Share on other sites More sharing options...
DekDaeng Posted March 14, 2020 Author Share Posted March 14, 2020 On 3/5/2020 at 4:14 PM, Crossy said: Is the foot valve serviceable / obstructed (not closing)? Possible air leak on the suction side? I put a new foot valve on - it leaks a little. May make a new one with a softer silicon o ring to seal. But I can fully prime, at top of well riser, and at pump inlet. Still, it will not start pumping. Have found a temp soln, connect to neighbours town supply during the night (when town pressure is ok - then pump pumps well, 30 min I can pump enough for the garden etc for next 24 hours, saved in big rice storage bins. Much better than carrying it up! Well water level is pump -6M; drought might be part of the problem Anybody got an ETA on the wet season? Link to comment Share on other sites More sharing options...
DekDaeng Posted April 23, 2020 Author Share Posted April 23, 2020 On 3/14/2020 at 4:35 PM, DekDaeng said: I put a new foot valve on - it leaks a little. May make a new one with a softer silicon o ring to seal. But I can fully prime, at top of well riser, and at pump inlet. Still, it will not start pumping. Have found a temp soln, connect to neighbours town supply during the night (when town pressure is ok - then pump pumps well, 30 min I can pump enough for the garden etc for next 24 hours, saved in big rice storage bins. Much better than carrying it up! Well water level is pump -6M; drought might be part of the problem Anybody got an ETA on the wet season? Right, Crossy. An old slip joint at top of well decided to start leaking. Had not moved or changed in ~ 15 years, so did not suspect it. Gold standard leak test is air pressure test. Prime full circuit with water, then inject air @ 40psi. You will find all leaks in seconds. Actually only leaks on suction side matter - leaks on the output / pressure side find themselves : - ) If you haven't got a compressor, you may be able to bleed air off a spare tyre to pressurise circuit. Chok dee. 1 Link to comment Share on other sites More sharing options...
Led Lolly Yellow Lolly Posted April 28, 2020 Share Posted April 28, 2020 Are you sure polarity is in order? I had a headache with a pump recently. Someone had fiddled around with the start capacitor and it was running backwards. Link to comment Share on other sites More sharing options...
bankruatsteve Posted April 28, 2020 Share Posted April 28, 2020 2 minutes ago, NilSS said: Are you sure polarity is in order? I had a headache with a pump recently. Someone had fiddled around with the start capacitor and it was running backwards. Uhm... capacitors are non-polar. Link to comment Share on other sites More sharing options...
Led Lolly Yellow Lolly Posted April 28, 2020 Share Posted April 28, 2020 (edited) Ahem, well some have polarity, ahem. but I know that, yet on some pump designs the wiring configuration will cause the pump to run backwards. This is suspect to be the problem for the OP. Edited April 28, 2020 by NilSS Link to comment Share on other sites More sharing options...
Mama Noodle Posted April 28, 2020 Share Posted April 28, 2020 Just now, NilSS said: I know that but on some pump designs the wiring configuration will cause the pump to run backwards You're thinking about DC motors Link to comment Share on other sites More sharing options...
Mama Noodle Posted April 28, 2020 Share Posted April 28, 2020 On 3/1/2020 at 2:24 PM, DekDaeng said: I have a 'Forerun' brand 550 watt pump, which just refuses to prime. In spite supposedly being able to provide 8 m suction, even if I prime it with 8 m head! (i.e. from the top of my 3 story shophouse) it still refuses to pump! I have had it working intermittently, (from a large bucket) but when I place it 'in line' - it just sits and spins - as you can see in the vid. Previous pump was a 250 watt fujika, which had ok performance, so 550 SHOULD be great for my place & roof garden So this pump is supposed to pump from somewhere (a well?) UP 3 stories? Suck water from 8m down and push it up 3 stories? Link to comment Share on other sites More sharing options...
Led Lolly Yellow Lolly Posted April 28, 2020 Share Posted April 28, 2020 (edited) Quote You're thinking about DC motors Excuse me but switching the starter winding leads on a single phase AC motor will cause it to run in reverse. I know what I'm talking about. Edited April 28, 2020 by NilSS Link to comment Share on other sites More sharing options...
Mama Noodle Posted April 28, 2020 Share Posted April 28, 2020 2 minutes ago, NilSS said: Excuse me but switching the starter winding leads will cause a single phase AC motor to run in reverse. I know what I'm talking about. Link to comment Share on other sites More sharing options...
Led Lolly Yellow Lolly Posted April 28, 2020 Share Posted April 28, 2020 Link to comment Share on other sites More sharing options...
Crossy Posted April 28, 2020 Share Posted April 28, 2020 Everyone may wish to read post #12 where the problem and solution was described Link to comment Share on other sites More sharing options...
sometimewoodworker Posted April 28, 2020 Share Posted April 28, 2020 4 hours ago, bankruatsteve said: Uhm... capacitors are non-polar. Electrostatic capacitors are nonpolar, meaning they can be connected in any direction of polarity, and there is no difference. Electrolytic capacitors are polar by nature, they can be entertaining, through shocking to deadly if reversed and a substantial charge is applied. Link to comment Share on other sites More sharing options...
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