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Rockinfigs's avatar
Rockinfigs
Explorer
Jun 12, 2013

Water Pump Problem Need Help!

Hi guys. I posted my problem a while back but didnt get alot of reponse and i cant seem to find the original post. Anyways I have a 2014 Attitude 27CBG. I have the Shurflo Revolution 4008 model water pump. I noticed one day that while running the gen when i have the water fully open..wether in kitchen, bath or shower, the pump would surge and the pump would sound likes its turning on and off. So i blamed it on a bad water pump and the dealer replaced it. Well the pump still surges when the gen is on..When I turn off the gen..it would surge on and off for a little and after a while it would flow at a constant even flow..(im testing it with faucet fully open). So not sure whats causing this..is it an electrical issue? is the gen not providing the pump enough power or too much power??

One thing that might be linked or maybe not is my first trip out with the TH..i stated the AC with the gen on and the gen died..i tried to turn on gen again . it would start for 1 min then die again..they told me it was a bad fuel pump and replaced it and it works fine now..but not sure if that has anything to do it the water pump and the electrical?? maybe maybe not..Here is a video of what it looks and sounds like..thks

http://s43.photobucket.com/user/Rockinfigs/media/20130609_151521.mp4.html

19 Replies

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  • Ex-Tech's avatar
    Ex-Tech
    Explorer
    Jun 13, 2013
    The pressure switch is on the head of the water pump and is a small screw for adjustment.
  • HiTech's avatar
    HiTech
    Explorer
    Jun 13, 2013
    Is the pump surging while running continuously, or is the pump just cycling on and off, with the pressure going higher when the pump is running?

    Jim
  • RoyB's avatar
    RoyB
    Explorer III
    Jun 13, 2013
    The water pump runs from 12VDC from the 12VDC Power Distribution Panel. When you are NOT on shore power or running from the generator then the DC VOLTAGE is fed by your battery. If the battery is fully charged this will be 12.6-7VDC. If the battery is at 50% charge state this will be 12.0VDC feeding your DC Power Distribution Panel.

    When you connect to shore power or connect up with the generator then the on-board converter/charger is now active and it produces a constant 13.6VDC feeding the DC Power Distribution Panel. Your DC Water Pump is now using 13.6VDC verses what was coming from the Battery (12.0VDC to 12.6-7VDC).

    The DC water pump runs better with the higher DC VOLTAGE...

    Here is a typical WIRING BLOCK DIAGRAM of a typical 30AMP Trailer system


    just my thoughts
    Roy Ken
  • Rockinfigs's avatar
    Rockinfigs
    Explorer
    Jun 12, 2013
    ex tech..where is the pressure switch on the pump?
    also why is it only doing it when the gen is on ?? when the gen is not on..the water pump works perfectly without any surges ..constant even flow.
  • Ex-Tech's avatar
    Ex-Tech
    Explorer
    Jun 12, 2013
    A surging water pump is not normal.
    Every RV I purchased I have had to adjust the pressure switch on the water pump.
    After that, no more surging, even with a faucet opened only half way.

    Also has nothing to do with voltage since the pressure switch is affected by water pressure and not voltage.
  • akrv's avatar
    akrv
    Explorer
    Jun 12, 2013
    Without the gen running the voltage to the water pump will be about 12.5 . With gen running the voltage will be 13.6 . At the higher voltage the pump runs faster and can push more water than the demand and will turn off and on. At the lower voltage it can't keep up with the demand and nevr shuts off.

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