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  1. U

    Sensorton question

    Wayne, I have just developed the identical problem you are describing. Did you find a solution or did you have to replace the acceptor. Any help would be appreciated. Thanks, Bob
  2. U

    spot free rinse back flow

    My wax and high pressure soap are gravity fed from holding tanks. The wax has a simple shut off valve, so I did a test by turning that valve off to simulate having a check valve there, and then ran the spot free. What happened was my back pressure gauge went up to 120 psi. I am definitely...
  3. U

    spot free rinse back flow

    There is no city pressure for rinse and I am beginning to think you are right about a problem with the pump. I noticed today that when any low pressure function is being used the gauge on the pump is showing 40 psi of back pressure. I have shut the bay down for now as I am not able to get to...
  4. U

    spot free rinse back flow

    Thanks for all you help. I check or replaced all the check valves and solenoids with no luck. I decided to start from the beginning and checked every line coming in and out of the pump and in the very back of the pump, which happens to be on the bottom of the stand with another pump above it...
  5. U

    spot free rinse back flow

    Thanks to everyone for the great suggestions. I went through and checked or replaced all check valves and solenoids and nothing had changed. So I started from the very beginning and started tracing all the lines and found a very very small leak on the soap line running from the solenoid to the...
  6. U

    spot free rinse back flow

    I have not noticed back flow into a tank. The HP source is gravity fed from a tank which has what appears to be a rather large pvc check valve on each line. I will check that in the morning. That is the only check valve I see that has anything to do with the feed to the high pressure pumps...
  7. U

    spot free rinse back flow

    Thanks for the replies. The back flow is in the same bay as the spot free. I noticed the problem because when the spot free was in use and I was in the equipment room I heard a buzzing sound which turned out to be the wax tubing shaking against the pump stand. I then checked the gauge and it...
  8. U

    spot free rinse back flow

    Hello Everyone, I have been checking out this site for a few years now and you all have been very helpful. Been in the car wash business for almost 6 years and have learned a lot with your help. I have a 6 bay ss wash and in 1 of the bays when the spot free rinse is in use i am getting a...
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