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01-14-2020, 11:39 AM
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#1
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Junior Member
Join Date: Jan 2020
Location: Wichita Falls
Posts: 7
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Gone through 2.5 tanks of water in 3 days
I just picked up my greyhawk 30z 3 days ago with a tank of freshwater. By the next morning I had only a third of a tank filled with freshwater. I took it back to the dealership to have the tanks filled again. The following morning the tanks showed that it was empty. The tanks were nearly empty indicating that the sensors were working correctly. The problem appears to be dad when driving the vehicle on an incline the water rushes towards the overflow hoses and empties the tank. Has anyone had this problem and what was the solution to it?
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01-14-2020, 12:03 PM
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#2
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Senior Member
Join Date: Jan 2019
Location: Litchfield, CT
Posts: 476
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There have been discussions here from some who have had the same issue. I have not experienced it. I assume it does not show any sign of draining while not in motion? I've heard some owners have installed a shutoff valve on the drain and/or vent, but I would be careful to research it before doing so.
You should be able to find this topic by searching through the tech topics at the lower sections of the Forum page.
__________________
2020 Eagle HT 30.5 CKTS Modern Farmhouse (16" wheels, spring shackles set on lower hole of frame, SumoSprings TSS-107-40, standard kingpin, B&W Companion slider, TST-507 TPMS, Progressive Industries hardwired 50A EMS HW-50C)
2019 F250 SRW SuperCab 4X4 SB 6.2 (10,000# GVW) 3.73 Axle 18" wheels
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01-14-2020, 12:09 PM
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#3
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Senior Member
Join Date: Jan 2019
Location: Litchfield, CT
Posts: 476
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__________________
2020 Eagle HT 30.5 CKTS Modern Farmhouse (16" wheels, spring shackles set on lower hole of frame, SumoSprings TSS-107-40, standard kingpin, B&W Companion slider, TST-507 TPMS, Progressive Industries hardwired 50A EMS HW-50C)
2019 F250 SRW SuperCab 4X4 SB 6.2 (10,000# GVW) 3.73 Axle 18" wheels
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01-14-2020, 12:31 PM
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#5
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Senior Member
Join Date: Apr 2017
Location: Inland Empire, California
Posts: 2,006
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You may get a lot of replies as this subject has been discussed many times. It is a very common issue because of the way Jayco fills their tanks.
My 2017 Greyhawk would lose 1/3 of a tank between home and our site. Water flows out the overflow hoses. This really came to a head when I pulled in at my propane fill station which was angled downward. While I sat there water was flowing out of my rig all over the place.
I put shut off valves on all 3 hoses and that totally solved my problem. Many others have done the same thing. You just have to remember to open the valves when filling or you will blow up your tank. Also need to open one hose while camping to allow air to enter.
__________________
Jim
Retired electronic technician (45 years in the field)
2017 Greyhawk 29W (solar & many other mods)
wife (maybe I should have given her top billing)
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01-14-2020, 01:43 PM
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#6
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Senior Member
Join Date: May 2012
Location: Minnesota
Posts: 9,783
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Lots of discussions regarding FW tank siphoning.
What a number of people have done is add a shutoff valve on the overflow pipe. You MUST open the valve when you fill the tank, or you risk rupturing the tank.
I found the vent/overflow tube, and pushed it up as I as I could and still have it sticking through the floor. I went inside of my TT, and I clamped the hose to the wall, with the loop as high as I could. Before I clamped it to the wall, I found after a number of trips the hose would vibrate back down and the tank would siphon again. Since adding the clamp, I have never had any siphoning.
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01-14-2020, 01:58 PM
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#7
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Senior Member
Join Date: Sep 2013
Location: South Texas
Posts: 7,217
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My tank has 3 vent hoses. I put 1/4 turn valves on 2 of them and left the third alone. This allows for passage of air and overflow when filling as well as passage of air while using water, and doesn't drain the tank in transit.
If I'm filling the tank, sometimes I will remember to open the valves, but my tank fills very slowly, so not opening the other two valves has never caused a problem.
__________________
-2018 Greyhawk 29MV
-2020 Jeep Wrangler Unlimited (JLU) (Primary Toad)
-1994 Jeep Wrangler YJ (Secondary Toad)
-2014 Jay Flight 28BHBE & Ram 2500 6.4L CC 4x4 (sold)
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01-14-2020, 02:31 PM
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#8
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Senior Member
Join Date: Dec 2012
Location: Southern Indiana
Posts: 3,209
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I bought one of these https://www.amazon.com/Rainwave-RW-9...CYEQKZA29QEFEK to measure the amount of water going onto my tanks. I have twin 40 gallon tanks and when the meter reads 76 gallons I slow the fill rate way down and this seems to help with the siphoning effect. When it starts to dribble out the overflows, I plug them up and drive to my campsite, unplug and tanks full.
__________________
2012 Eagle 320 RLDS
2017 Ford F-250 FX4 Crew STX 6.2l
3.73 E-locker
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01-22-2020, 11:01 AM
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#9
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Junior Member
Join Date: Jan 2020
Location: Wichita Falls
Posts: 7
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Thanks for everyone's help
I gave a lot of thought to everyone's input. Due to the shallow nature of the tank and the position of the overflow hoses, I think there are two issues - syphoning and general water loss due to the angle of the vehicle. I routed the lines into a neighboring storage compartment, connected valves to the lines, and adde hose to exit the compartment. This seems to be working. I put a towel over the steering wheel of rig as a reminder that I need to shut off the valves before I travel. I put up a sign near the switches that need to be changed before filling the tanks to remind me to open the valves as well. Thank you for everyone's help I appreciate it.
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