Reply
 
Thread Tools Search this Thread Display Modes
 
Old 02-04-2009, 10:28 AM   #1
1 Rivet Member
 
1996 25' Excella
Delta Junction , Alaska
Join Date: Jun 2008
Posts: 5
Water pump losing prime

Hello All,

We bought our 1996 Excella new in early 1997. Our 12v water pump loses its prime after a day on the road. When I looked into this, the service manager tells me it is common due to the location of the pump being above the tank. I find this a little hard to believe, but after having them replace the pump it still did the same thing, so perhaps they're right. I was thinking a simple one way valve ought to solve the problem. Currently the only way to get the water flowing is to empty the closet, and prime the pump by pouring water into the filter housing. Has anyone else had this problem and if so what have you done to fix it?

Brett
__________________

__________________
brhulen is offline   Reply With Quote
Old 02-04-2009, 12:50 PM   #2
Rivet Master
 
DEITZ645's Avatar

 
2006 30' Classic S/O
Currently Looking...
Mohrsville , Pennsylvania
Join Date: Jun 2006
Posts: 1,313
Images: 10
Brett,
Both our '87 and '06 have the water pump higher than the potable water tank and we have never lost a prime that I know of. I think the pumps already have a mechanism that prevents backflow. Maybe you have a slow leak in the leg between the water tank and the pump inlet??? Small hole in tubing? Hose clamps not tight? Leak in the filter bowl? At least that is where I would start, especially if it is a new water pump.
__________________

__________________
Carl, Elaine & Finn The Beagle
2006 30' Classic W Slide & Limited Package Katarina
2006 GMC 2500 HD 6.6 Turbo Diesel Crew Cab 8' Bed
TAC PA-3
S/OS#042
AIR #14487
NQ3U (was KB3UOM)
DEITZ645 is offline   Reply With Quote
Old 02-04-2009, 05:11 PM   #3
3 Rivet Member
 
crestonrv's Avatar
 
1948 16' Wee Wind
1964 26' Overlander
2007 19' Bambi
crossville , Tennessee
Join Date: Jun 2006
Posts: 172
Images: 7
Blog Entries: 5
pump has check valve to prevent that.does your pump have strainer/prefilter on it? they can cause it to loose prime by leaking air back to tank,won't show as leak unless you pressurize pick up line (normally is under vacumme).next guess is damaged diaphram in pump.
__________________
crestonrv is offline   Reply With Quote
Old 02-04-2009, 05:15 PM   #4
Rivet Master
Airstream Dealer
 
Inland RV Center, In's Avatar
 
Corona , California
Join Date: Feb 2002
Posts: 16,499
Images: 1
Quote:
Originally Posted by brhulen View Post
Hello All,

We bought our 1996 Excella new in early 1997. Our 12v water pump loses its prime after a day on the road. When I looked into this, the service manager tells me it is common due to the location of the pump being above the tank. I find this a little hard to believe, but after having them replace the pump it still did the same thing, so perhaps they're right. I was thinking a simple one way valve ought to solve the problem. Currently the only way to get the water flowing is to empty the closet, and prime the pump by pouring water into the filter housing. Has anyone else had this problem and if so what have you done to fix it?

Brett
The pump can lose it's prime, if the intake hose is bad, if the inline filter is bad or cracked, or if the internal pump valves are bad.

Any one or more of those problems will provide that grief.

What brand and model pump do you have?

Andy
__________________
Inland RV Center, In is offline   Reply With Quote
Old 02-04-2009, 06:43 PM   #5
3 Rivet Member
 
1960 24' Tradewind
Riverside , California
Join Date: Mar 2005
Posts: 189
The Shurflo pump will prime from 6', your closet floor may be 12" above the bottom of the tank
PUMP
Type: 3 Chamber Diaphragm
Ports: 1/2-14 NPSM-Male.
Liquid: 130 F [54 C] Max
Prime: 6 feet [1.82 M]
Inlet PSI: 30 PSI [2.1 Bar] Max
Run Dry: Yes
ELECTRICAL
Motor:
Greg
__________________
ZoomZoom is offline   Reply With Quote
Old 02-04-2009, 07:12 PM   #6
Rivet Master
 
vswingfield's Avatar
 
1983 34' Excella
1967 24' Tradewind
Little Rock , Arkansas
Join Date: Nov 2006
Posts: 3,771
Images: 32
Rivet Prime Problems

I agree that you probably have some sort of leak on the intake side.

You could try printing this list and attaching it to the pump: 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97.
__________________
Vaughan
vswingfield is offline   Reply With Quote
Old 02-05-2009, 05:59 AM   #7
Rivet Master
 
DEITZ645's Avatar

 
2006 30' Classic S/O
Currently Looking...
Mohrsville , Pennsylvania
Join Date: Jun 2006
Posts: 1,313
Images: 10
Quote:
Originally Posted by vswingfield View Post
I agree that you probably have some sort of leak on the intake side.

You could try printing this list and attaching it to the pump: 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97.
ARGHHHHHH...Math humor

As jimmy Buffett says..."Math Suks"
__________________
Carl, Elaine & Finn The Beagle
2006 30' Classic W Slide & Limited Package Katarina
2006 GMC 2500 HD 6.6 Turbo Diesel Crew Cab 8' Bed
TAC PA-3
S/OS#042
AIR #14487
NQ3U (was KB3UOM)
DEITZ645 is offline   Reply With Quote
Old 02-05-2009, 08:18 AM   #8
Rivet Master
 
Lumatic's Avatar

 
1971 25' Tradewind
1993 34' Excella
Currently Looking...
Estancia , New Mexico
Join Date: Feb 2005
Posts: 6,642
Images: 16
Blog Entries: 1
On my 71 my fairly new Sureflo has trouble pumping just after an empty fresh water tank is refilled. It's been like this since installed. The tank needs to be full or nearly so before the pump starts actually puping water. After that no problem. Any ideas what's going on?
__________________
Sail on silver girl. Sail on by. Your time has come to shine.
Lumatic is offline   Reply With Quote
Old 02-05-2009, 08:55 AM   #9
1 Rivet Member
 
1996 25' Excella
Delta Junction , Alaska
Join Date: Jun 2008
Posts: 5
Water pump

Thanks everybody! Well when springtime comes, (it was -42 degrees yesterday morning), and as time allows I'll dive back into the closet and check for some of the solutions offered. I'm betting on the filter housing. It is a new Shureflow pump installed by the A.S. service department, so I tend to think it has nothing to do with the pump. Even the manager agreed it seems to be a common problem. I haven't seen any indication of a leak, except where I spill water trying to prime the darned thing. If nothing else maybe I'll install one of those squeeze bulbs on the suction side like they use on outboard motors to prime it. Or perhaps I could just buy another pump to prime the pump, to prime the pump, to prime the pump etc. I must say my darling wife is getting tired of having me empty the closet each time and listen to me rant.
__________________
brhulen is offline   Reply With Quote
Old 02-05-2009, 11:31 AM   #10
4 Rivet Member
 
sander17's Avatar
 
1996 28' Excella
Okemos , Michigan
Join Date: Apr 2003
Posts: 305
Images: 42
Another sure sign of a leak on the intake side of the pump is air in the water. A leak on that side may not drip, but you may see "spitting" when running water into the sink. Our previous trailer had a crack in the filter housing which was impossible to see when installed deep inside the cabinet.
If you do not have any air in the water stream, I would be suspicious of the pump innards.

(Would that be a stream of air in your water stream in your airstream?)
__________________

__________________
Dave
Okemos, MI
T.V.:'05 Dodge Ram 2500 4x4 Quad Cab Cummins
AIR#2276
sander17 is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
No Prime, or no pump? blaisew Fresh Water Systems 5 12-14-2007 01:38 PM
prime water system? chapparel Fresh Water Systems 5 06-09-2007 09:39 AM
68 water pump-should the pump cycle? Boondocker Water Heaters, Filters & Pumps 8 08-06-2006 11:11 AM
Water pump does not prime ipso_facto Water Heaters, Filters & Pumps 12 04-18-2004 11:40 AM
Water pump won't prime??? roessler Water Heaters, Filters & Pumps 5 01-22-2003 09:21 AM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:18 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.