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Old 11-03-2015, 11:39 AM   #1
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City water to pump use problem.

Hi to all. New here. Trying to get some insight to a very aggrevating problem. I have a 2012 Jayco Swift. I really like the camp, but there is a problem that no one seems able to diagnose.

I travel all over the U.S. to shooting competitions. Some places have city water hookups and some don't, so it is nice to have the options with the new camp. The trouble is this: My water pump works great when I need to use it, but if I hook up to city water for even a day or two, then go back to using the pump later, the pump is always toast. It runs, but will never build pressure. The dealership replaced 4 pumps when under warranty, but now it's off warranty and a real pain and expensive. They gave me several reasons and told me everytime that it was now fixed. When a new pump is put on, it immediately builds suction and pressure and works fine. Given that new ones out of the box work fine, that negates the "it needs primed" theory. The dealership last time said I needed a pressure regulator and that was the problem. I bought their 25.00 regulator and even turned the pressure way down the last time. The shower barely trickled enough water to take a shower. Sure enouth, when I got back and tried to use the pump, it failed.

It is really quite strange. I don't think the dealership knew what the problem was or maybe they didn't believe me. At this point, I am having to not use the city water hookup at all and just putting water in the tank and using that system. If anyone out there has any idea what could be happening, please let me know. I appreciate it. Right now, I would not buy another Jayco just because of this problem. Thx.
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Old 11-03-2015, 11:50 AM   #2
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Sounds like a vapor lock to me. That's what may be killing the pump. Just like a fuel pump on a vehicle can't pull fuel from the tank to the engine without having a vapor valve on the tank. The pump would run and eventually burn up. There's no release of pressure to allow the fuel to flow. I know, it's not an engine but same principle. I'm not really sure if there's a vapor valve on these units to be honest. Maybe some kind of "checkball" or "one-way valve maybe?"

Keep us posted!
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Old 11-03-2015, 01:18 PM   #3
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Wow, 4 pump replacements is huge! In the ten years I've been rving I haven't had to replace a pump. I've even left the pump running dry overnight and it still worked the next day. Is there any chance a valve line-up requirement is being overlooked by you and changed by the dealer without your knowledge?
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Old 11-03-2015, 01:27 PM   #4
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The dealership has assured me more than once that nothing needs to be done to switch from city water to using tank/pump and vice versa. How it can possibly effect the pump is beyond me. Thanks for ideas.
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Old 11-03-2015, 01:37 PM   #5
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If there's a warranty paper trail from the failed fixes, it might not hurt to run it up the food chain to the regional Jayco Rep, and see if the factory will help, either to fix for good, or re-imburse you for subsequent pumps you paid for. Sometimes the "squeaky wheel", ya know.
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Old 11-03-2015, 01:42 PM   #6
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- how do you fill your FW tank in the Swift? Gravity fill directly into the tank? or a valve line up change from your city water connection?
- do you have a check valve on the discharge of your pump? on most systems, the pump itself acts as a check valve to prevent city water from flowing into your FW tank.
- the water pump cycles based on discharge pressure. Meaning, if your pressure regulator is set low enough, your pump will cycle on to make up the difference.
- is your FW tank FULL when you try to use it after using city water?
- try opening ALL your faucets when you first turn on your pump. You should hear a change in tone from the pump as the valves are opened, AND you should feel air coming out of the faucets as you open them up.
- the pump SHOULD self-prime and get water flowing.

- write to jayco technical folks and get an answer.

keep us posted once you find the culprit.

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Old 11-03-2015, 02:03 PM   #7
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This is a stretch, but is there any chance the check valve on the city water inlet is sticking open? This would cause water to flow out of the city water inlet fitting and would be easily noticed but it would cause that very problem as the water would flow out of the inlet instead of into the plumbing.
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Old 11-03-2015, 02:28 PM   #8
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Tjp: I have tried it with water in the tank. No difference. I fill with water hose from faucet into Fw inlet on side of camp. Yes, the pump in this case is the check valve. I just got back from a trip using the city water hookup for a week (phoenix). Back in Wyoming and tried to winterize by normal way of bypassing hot water tank and using winterizing hose. Put hose in a gallon of rv anitfreeze and turn on pump. No pressure same as always. I emailed service@jayco.com so we'll see if anything happens. I couldn't find anything on a regional center.

Hoppers: I would say that it has SOMETHING to do with the city water hookup check valve like you had suggested. How it can damage the pump so quick is beyond me. Thanks for help guys.
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Old 11-03-2015, 02:34 PM   #9
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Look for any problems in the hoses from the suction point. How shorter the hose to the pump how better it is. Also a hose with a bow up can give air pockets. If it draws air for a long period it will ruin the pump. Keep your pumps and put in a new kit so you always have a backup. They really should have back up valves in the tank to make it a better system. In old trailers of the 70's they had FW tanks inside the units and the pump suction was always level with the bottom of the tank. Good luck with all the testing.
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Old 11-04-2015, 06:00 AM   #10
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When you are hooked to city water, you don't turn the pump on do you?

When you try the pump sucking from the fresh water tank, do you open a nearby faucet to allow the air to purge out?

When you say the pump is ruined, do you mean it is totally fried or just isn't building pressure?
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