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Old 09-08-2015, 07:49 AM   #11
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Had same issue during 1st camping trip with 264BHW, found that hose clamp next to pump from fresh water tank was bad, looked just fine and seemed tight, but after replacement all better.

Larry J
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Old 09-08-2015, 07:58 AM   #12
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Also check the filter screen housing. The housing on ours fractured a few months after we got our trailer. It would not suck (well maybe it did) water very well. To get by for the weekend once I diagnosed the issue was to wrap the cup portion with electrical tape. Make sure the O-ring is seated properly, threaded on correctly (not cross threaded), fractures in the clear portion, etc.

If it will not pull from the tank or the siphon tube, the issue must between the pump and the diverter valve (FW tank/siphon valve).

Let us know what you find
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Old 09-08-2015, 10:00 AM   #13
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I have a very similar problem with the Shurflo 4008. The pump will run continuously and not pump water unless I open a faucet to relieve the back pressure.
I had the exact same symptom when trying to winterize this weekend. Hose in the antifreeze and all the other valves closed. The pump would pull the antifreeze a few inches out of the bottle and then it just sat there humming away.

Things I have tried:
Cleaned filter screen (wasn't dirty)
Tightened all lines
Totally replaced pump (new pump did the same thing)

I know I have no leaks on the downstream side as the system will stay pressurized for weeks while in storage. My pump will even do this after it is primed during regular use and the accumulator tank seems to exacerbate the issue as well. Short of replacing all the valves and lines on the incoming side I can't find an air leak. I have read of a few of these issues with the Jayco's which I am assuming all run the same Shurflo 4008 pump and I think it may be a pump issue. But I am sure there are a lot of people out there with no issues so maybe it is just a hard to find air leak.

Let us know what you figure out. Maybe it is the cheap-o plastic valves on all the incoming lines. Our trailer did not do this for the first season. Only after it sat for a winter.
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Old 09-09-2015, 11:18 AM   #14
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Problem located and remedied !

1.
I closed both valves to the water heater, opened the anti freeze bypass valve and fresh water inlet valve...would not pump.
2.
Removed screen filter for the third or fourth time and applied a smear of jack's formula multilube to the rubber gasket. Reinstalled screen filter. Water came up higher in feed line but still not pumping.
3.
Opened antifreeze filler valve and sucked on line drawing water up into both line and pump, sealed end of line with thumb and observed water did not flow back therefore no water leak. Closed antifreeze filler valve, turned on pump and all was working.
4.
Drained water from tank so feed line was empty, refilled tank, turned on pump...did not draw water.
5.
Got under TT and used strap ties to hold water line up to bottom of TT taking out all sagging in line...SUCCESS, all is now working!
Thank you to all who contributed.
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Old 09-09-2015, 11:37 AM   #15
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Thanks for the update Did you ever think that having too much hose would be a problem??
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Old 09-09-2015, 12:00 PM   #16
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Quote:
Originally Posted by bedrck46 View Post
thanks for the update did you ever think that having too much hose would be a problem??
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Old 09-09-2015, 12:01 PM   #17
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Nope !
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