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Old 06-02-2014, 02:30 PM   #1
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having problem with my two fresh water tanks in 338 rets

well in two outings with the new camper we have had water problems both times . so far heres what i have done. innitially i pulleed the filter bowl off the pump thinking maybe it was drawing air into the system and that didnt change anything so figuring it had a issue with either venting or a loose line i pulled the plastic underpinning down on the left side to see exactly what the whole fresh water plumbing was from the tank to pump ... this is when i discovered there were two tanks one in front of axle and one behind tied together with half inch pex line and on each was a low water drain. The front tank was low and the back tank looked 2./3 full so now i assume i have a venting problem with the front tank causing the air in tank not to allow it to fill thus causing the pump to draw air in from the empty tank closest to pump line. I felt up where the tank vent was and it was under the floor right beside the 6 inch hole where all the lines came through the floor and it was kinked against the floor shut. So i took a wood chisel and took out enough of the floor to unkink the vent line. but even though when i filled it up it filled up this time it still didnt equalize out with the rear tank as it went down. Now when you fill it it fills through the front tank and then vents the water when full out the back tank so i know water is passing from front to rear on fill but if both tanks are vented and water passes through them when filling why wont they equalize upon use when i opened the two low water drains on the tanks leaving the campground today the front drain quit and the rear was still going yet they are both connected ? Sorry for the long post but i am sorta stumped
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Old 06-02-2014, 03:09 PM   #2
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Call Jayco and get a plumbing drawing for your trailer.
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Old 06-02-2014, 04:03 PM   #3
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I requested a wiring diagram for my trailer and got the following reply this morning
Good Morning Craig,

Thank you for contacting Jayco customer service. Unfortunately, Jayco's policy states, no prints can be supplied to the retail customer while the warranty is still in effect due to liability reasons. Jayco does recommend all repairs and installation of accessories to be performed by a trained RV technician. If you are having issues with the wiring or electrical of your unit please contact your selling or closest Jayco dealer. We do apologize for any inconvenience this may have cause. If you should need further assistance, feel free to contact us via email or phone 800-283-8267.




Sincerely,

Lisa Luce
Customer Service Specialist
Warranty/Technical
Jayco, Inc.


So if your trailer is still under warranty I would not expect to be successful.
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Old 06-02-2014, 04:18 PM   #4
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Let them fix it under warranty.
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Old 06-02-2014, 06:50 PM   #5
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well i would love to get them to fix it but when i am camping and it isnt working i am not going to pull up and leave for something that i can at the least get functional until such a time i have time to drop the trailer off and also since the problem occurs intermittantly when front tank runs out i am not sure they could repeat the problem to repair it .... i dont like having to repair anything new but having had to always repair all of my rvs i feel like i am as qualified as they are to make the repairs and make it work the way it should .... its just frustrating to have to go through and troubleshoot each part of the plumbing to find all the issues but i am getting there one step at a time
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Old 06-02-2014, 07:43 PM   #6
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Jayco seems to have constant problems whenever they have 2 freshwater tanks coupled together. Lots of people have problems with poor venting, siphoning out of the overflows, leaks, sagging tanks, etc. I wish they would just get it figured out and fix these problems as they have been going on for years and the new models seem to be as problematic as the older ones.
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