oldjohnt Posted January 16, 2023 Report Share Posted January 16, 2023 Soooooooo I had an older Flo Jet fresh water pump and one of those pressure accumulator tanks that allowed for smooth even no short cycling pressure at the faucets....(worked great smooth even pressure no short cycling) The old pump was failing so I just replaced it with a Shur Flo 4008 -101-A65 55 PSI Pump (dont know the kick in pressure) and made NO changes to the pressure accumulator left it in the circuit.......AFTER the new pump was installed it started the classic short cycling surging with NO smooth regulation like before.....I let water drain and had pump on n off etc but it didnt help......I had water off, no pressure, let the air out of the tank, recharged to 30 PSI (figured it needs below the kick in PSI but dont know what that is) NOW THE SHORT CYCLING AND SURGING IS MUCH WORSE grrrrrrrrrrrr With such small volume its hard to tell if the air bladder tank is holding but Im pretty sure its holding at 30 PSI BUT NOW SHORT CYCLING IS TERRIBLE Ideas ?? hints ?? welcome THANKS YALL John T NOTTTTTTTT a plumber grrrrrrrrrrr Quote Link to comment Share on other sites More sharing options...
Wrknrvr Posted January 16, 2023 Report Share Posted January 16, 2023 Just a really wild guess. Bladder rusted to tank inside. Not leaving the bladder function as normal. Really wild guess? Quote Link to comment Share on other sites More sharing options...
Wrknrvr Posted January 16, 2023 Report Share Posted January 16, 2023 Depressurization of the tank. Operating pump to see if the tank will let the bladder loose. But I bet the air side of the bladder is full of water. Just guessing. Quote Link to comment Share on other sites More sharing options...
Darryl&Rita Posted January 16, 2023 Report Share Posted January 16, 2023 Agree with Vern. Or did you close the tank isolation valve while working on the pump plumbing? Remember to open the valve? Don't ask me how I know this issue. Quote I have been wrong before, I'll probably be wrong again. 2000 Kenworth T 2000 w/N-14 and 10 speed Gen1 Autoshift, deck built by Star Fabrication 2006 smart fourtwo cdi cabriolet 2007 32.5' Fleetwood QuantumPlease e-mail us here. Link to comment Share on other sites More sharing options...
oldjohnt Posted January 16, 2023 Author Report Share Posted January 16, 2023 (edited) 39 minutes ago, Darryl&Rita said: Agree with Vern. Or did you close the tank isolation valve while working on the pump plumbing? Remember to open the valve? Don't ask me how I know this issue. I didnt close anything I just turned the pump off (and hose city water was off of course) and when I removed the hose on the pressure OUTPUT (accumulator tank input) side of the old pump there was a lot of water under a lot of pressure until it all drained out,,,,,,,,,then I installed new pump (did NOT mess with tank or bladder air pressure or anything) AND SHORT CYCLING SURGING TOOK PLACE and after I drained air pressure and re charged to 30 PSI now its worse gggggrrrrrrrrrrrrrrrr Im going right now and drain the air tank and refill to 20 PSI see what happens?? PS I let air out charged t0O20 NO CHANGE NO HELP i LET ALL AIR OUT no change no help still cycles and surges Air tank went abd in process of change need new tank """????/ John T Edited January 16, 2023 by oldjohnt Quote Link to comment Share on other sites More sharing options...
Wrknrvr Posted January 17, 2023 Report Share Posted January 17, 2023 If you drain your supply hose from the hydrant, then hook it back up. Then turn the water on. Next is to go inside and run the hot water only, it will put a air charge in your hot water tank. The excess air will come out of the hot faucet. That will provide a air cushion in the water system. The on/off pressure switch on your new pump may be adjusted so the on and off setting is too close. Although I never look at how to adjust one. A person could install a water system pressure switch like on a Well system. Many years ago I did that on a older RV. It is frustrating when simple things go into the unknown pain in the rear attitude department. Quote Link to comment Share on other sites More sharing options...
franco-bolli Posted January 17, 2023 Report Share Posted January 17, 2023 It's sort of acting like the accumulator isn't there. I see you said it's holding pressure. Is that when it's connected to the water line or just by itself, no pipe connected? If it's not holding pressure just by itself, the tank is bad. I wonder if the reading you're seeing is the "system" pressure and not the bladder pressure. I have a small expansion tank from Lowes installed, it's rated up to 60psi. The rig is in winter hibernation so I can't check what it's charged to, but I'm certain its more than 30 psi. Quote +++++++++++_____________________________________+++++++++++ 2021 Ram 3500 2017 Arctic Fox 25W(to be traded??) HAM guy (Ke7FIX), photography, woodworking (mostly sawdust), Electronics Technician, USAF DAV Going where everyone has gone before Link to comment Share on other sites More sharing options...
Wrknrvr Posted January 17, 2023 Report Share Posted January 17, 2023 If I remember correctly, you normally have 2 lbs less pressure than what the system cut in pressure is. If it is over it, the switch should not turn the pump on. Until the pressure drops in the water line. I believe that would give unstable pressure in the system. Quote Link to comment Share on other sites More sharing options...
oldjohnt Posted January 17, 2023 Author Report Share Posted January 17, 2023 PROBLEM SOLVED: My bad (Not familiar with borrowed compressor and its air chuck) I had borrowed a friends Milwaukee 20 V Lithium Digital Compressor (never seen or used it before) to air up the accumulator tank..You set the pressure to 30 PSI,,,,,,,,,,, Push the air chuck onto the tanks air bladder charge inlet,,,,,,,,,,You hear it make a seal, compressor loads down and it shuts off at 30 PSI SOUNDS REASONABLE Buddy comes over says you need to thread the chuck on NOT just push n hold although it sounds like it seals and pumps air until 30 and shuts off NOT I thread it full on, set to 30, pumps up to 30 and shuts off same as before HOWEVER as I fast as I can unscrew the chuck and hear air leaking DUE TO SUCH SMALL VOLUME OF BLADDER air pressure dropped down to 10 by the time it stopped. Sooooo I experimented a few times airing and unscrewing and reading digital gauge at end to see the pressure lost in process,,,,,,,,,Air it up to 50 PSI,,,,,unscrew chuck and at end its around 30 PSI,,,,,,,Pumps cut in pressure is around 30 to 35,(55 is cut off) NOW IT WORKS PREFECT, STEADY NEAR CONSTANT PRESSURE, NO SURGING OR SHORT SUDDEN CYCLING !!!!!!!!!!!!!!!!!!!! Moral of the story READ DIRECTIONS on something you're unfamiliar with (NOT my best practice lol) and never used before. That air bladder is so small even the slightest leak when disconnecting (removed as fast as possible) drops the internal air pressure Grrrrrrrrrrr Anyone here never made a mistake lol NOT ME and I admit it WELL DRATS John T Live in RV at Florida Flywheelers Fort Mead Florida now with good steady fresh water tank n pump pressure ONE HAPPY CAMPER Thanks everyone Quote Link to comment Share on other sites More sharing options...
Darryl&Rita Posted January 17, 2023 Report Share Posted January 17, 2023 Yay for happy campers. Quote I have been wrong before, I'll probably be wrong again. 2000 Kenworth T 2000 w/N-14 and 10 speed Gen1 Autoshift, deck built by Star Fabrication 2006 smart fourtwo cdi cabriolet 2007 32.5' Fleetwood QuantumPlease e-mail us here. Link to comment Share on other sites More sharing options...
RV_ Posted January 18, 2023 Report Share Posted January 18, 2023 Great thread and informative for new and experienced RVrs alike. Thanks for the rest of the story too John. Quote RV/Derekhttp://www.rvroadie.com Email on the bottom of my website page.Retired AF 1971-1998 When you see a worthy man, endeavor to emulate him. When you see an unworthy man, look inside yourself. - Confucius “Those who can make you believe absurdities, can make you commit atrocities.” ... Voltaire Link to comment Share on other sites More sharing options...
oldjohnt Posted January 18, 2023 Author Report Share Posted January 18, 2023 11 hours ago, RV_ said: Thanks for the rest of the story too John. Youre welcome I enjoy feedback and hearing what happened when a problem is posted here including mistakes grrrrrrrrrrrr lol John T Florida Flywheelers Fort Meade Florida Quote Link to comment Share on other sites More sharing options...
Kirk W Posted January 18, 2023 Report Share Posted January 18, 2023 50 minutes ago, oldjohnt said: when a problem is posted here including mistakes That tends to happen to us old guys. 🤪 Quote Good travelin !...............KirkFull-time 11+ years...... Now seasonal travelers.Kirk & Pam's Great RV Adventure Link to comment Share on other sites More sharing options...
RV_ Posted January 18, 2023 Report Share Posted January 18, 2023 5 hours ago, oldjohnt said: Youre welcome I enjoy feedback and hearing what happened when a problem is posted here including mistakes grrrrrrrrrrrr lol John T Florida Flywheelers Fort Meade Florida Me two! Quote RV/Derekhttp://www.rvroadie.com Email on the bottom of my website page.Retired AF 1971-1998 When you see a worthy man, endeavor to emulate him. When you see an unworthy man, look inside yourself. - Confucius “Those who can make you believe absurdities, can make you commit atrocities.” ... Voltaire Link to comment Share on other sites More sharing options...
Ray,IN Posted January 19, 2023 Report Share Posted January 19, 2023 (edited) One good thing about making mistakes at our age is plausible deniability. I would've likely done the same as you John. Edited January 19, 2023 by Ray,IN Quote 2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG retired;Good Sam Life member,FMCA ." And so, my fellow Americans: ask not what your country can do for you--ask what you can do for your country. John F. Kennedy 20 Jan 1961 Link to comment Share on other sites More sharing options...
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