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Old 08-05-2015, 07:26 AM   #1
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Water pump pick up issues

The water pump will leave approx. 16 gals in the tank and will not pick up prime at that level. Is the pick up line accessible from inside the storage compartment ?
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Old 08-05-2015, 07:51 AM   #2
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Welcome to the forum! What year and model do you have?
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Old 08-05-2015, 07:58 AM   #3
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Old 08-05-2015, 08:57 AM   #4
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Quote:
Originally Posted by Dave Tremont View Post
The water pump will leave approx. 16 gals in the tank and will not pick up prime at that level. Is the pick up line accessible from inside the storage compartment ?
Hi Dave... this post got me wondering. I put ONLY 20 gallons into my FW tank, since my TT is on a "weight diet."

Anyhow, are you dumping the FW tank into 5 gal pails to determine the 16 gallon volume? 16 gallons seems like a rather precise measurement.

The FW on my unit is actually a pair of tanks, but I've never really run out of water.
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Old 08-05-2015, 09:05 AM   #5
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I have the same problem (different unit; '14 28BHBE). There seems to be A LOT of water left in the tank after the pump stops picking it up. I haven't measured it yet, but it is a lot more than I think it should be.

I guess I'll make it a point to get under there and take a closer look for sure this week while I have the trailer home. I'm thinking I might get to where I'll call up Jayco and get a plumbing diagram so I can see exactly what is going on down there. Maybe a project for this winter...

I'm interested to hear what others have to say about this issue. I'm not so much concerned about the weight any more (bigger truck now, less weight worries), but if/when I need that water I'm afraid I won't be able to get to it.
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Old 08-05-2015, 09:16 AM   #6
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We dry camp a lot so using every bit of water is important, and yes after the pump lost water pickup I emptied the tank into a 5 gal pail. Does anyone know how the pickup is designed in the tank ?
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Old 08-05-2015, 09:31 AM   #7
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I would check the simple things first to be sure your pump is getting good flow.

This is a typical water flow chart for trailers when just using the water pump and the associated fresh water tank....


I would make sure the VALVES are all fully turned in the right direction etc... Might be allowing the water pump to suck some outside air if not...

Also the ONE WAY VALVES might have some trash in them slowing down the flow...

Has your problem always been there - perhaps the pump is not big enough to the job you are expecting?

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Old 08-05-2015, 09:32 AM   #8
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Quote:
Originally Posted by Dave Tremont View Post
We dry camp a lot so using every bit of water is important, and yes after the pump lost water pickup I emptied the tank into a 5 gal pail. Does anyone know how the pickup is designed in the tank ?
Sorry Dave, I wish I knew your tank's setup. With these enclosed bellys the simple things get difficult, eh?

I know on my old '04 Surveyor by Forest River the FW tank did in fact have a low point on the rear at the middle of the tank. The pickup hose was hooked to the low point. There aren't many Tank manufacturers, and if I recall, the pickups on most are molded into the tank.

For your sake and mine... I hope Jayco isn't using some sort of bulkhead fitting drilled into the side of the FW tank... that sounds like a leak just waiting to happen.

One more possibility - they use some sort of bung on the TOP of the FW tank, and stick the tube down into the tank. If the tube starts to recoil due to it's natural curvature, then the pickup could potentially lift off the bottom of the tank. But - that's pure speculation.

theres' only one way for you to know the truth. Cut open the belly enclosure, get some light in there, and take a look. Even if a fellow forum poster happens to have your exact model and year... these campers are basically custom built by humans, based on the model guidelines. They simply are not perfectly identical like automobiles being built by robots.

Good luck Dave, and post some pics when you get the nerve to create a looky-loo "door" into the enclosed belly. Be sure to fashion up some way to seal that "door" back up
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Old 08-05-2015, 09:50 AM   #9
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The system works fine when the water level is higher. This model has a manifold system with multiple valves for different scenarios i.e. normal, fill, city hook-up, sanitize. All positions work correctly. I was wondering if the pickup tube was flexible and weighted or rigid. We just purchased this unit and the previous owner never put water in the tank.
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Old 08-05-2015, 10:33 AM   #10
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Snip ...

One more possibility - they use some sort of bung on the TOP of the FW tank, and stick the tube down into the tank. If the tube starts to recoil due to it's natural curvature, then the pickup could potentially lift off the bottom of the tank. But - that's pure speculation.
This is what I originally thought may be the problem, but others have stated that the pickup to the pump doesn't drop into the top of the tank, it's supposedly plumbed to a fitting on the outside of the bottom of the tank.

Quote:
Originally Posted by Dave Tremont View Post
The system works fine when the water level is higher. This model has a manifold system with multiple valves for different scenarios i.e. normal, fill, city hook-up, sanitize. All positions work correctly. I was wondering if the pickup tube was flexible and weighted or rigid. We just purchased this unit and the previous owner never put water in the tank.
Mine too (except for the manifold system). ALL other systems/pressures/operations work as expected when there's at least 1/3 (according to the idiot light) water in the tank.

Someone else mentioned that it could be that the pump only picks up from one tank (I have two tanks tied together) and that the leftover water could be in the other tank. The hose that ties the tanks together is not at the absolute bottom of the tank, so there could be a bit of water there that is inaccessible simply because it cannot flow to the other tank ...

This is making me want to leave work and go home and look at my trailer right now. Alas, it will have to wait until tonight; I'll try to figure it out and get pics if I can ...
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