Thread Tools Search this Thread Display Modes
Old 04-23-2013, 07:58 PM   #1
3 Rivet Member
1969 27' Overlander
Boise , Idaho
Join Date: Apr 2013
Posts: 149
Images: 4
Teach me about water pumps?

Okay, I'm totally new to RVs, and I've taken on a complete rebuild of a 69 overlander. I'm a number of steps away from getting serious about plumbing, but I had some questions.

First, I found, uninstalled, the original water pump. At least I assume it's original. Has a little toothed belt on it. Were these any good? Do I want to use it (assuming it works), or is it a museum piece that should be replaced now rather than having it conk out in the middle of a camping trip?

Next, just a general question: how does a water pump know when to work. I understnad how pumps work, my question is simply what tells the pump to begin pumping? Is the water system always under pressure? Or does opening a tap somehow tell the pump to start pumping?
Jamespio is offline   Reply With Quote
Old 04-23-2013, 08:05 PM   #2
3 Rivet Member
1969 27' Overlander
Boise , Idaho
Join Date: Apr 2013
Posts: 149
Images: 4
Here's a pic of the pump I found in the trailer:

Also, attached to it is this thing:

What is it?

Final water pump question. How is it wired? Is it just two conductors?
Jamespio is offline   Reply With Quote
Old 04-23-2013, 08:14 PM   #3
Rivet Master
Silverflames's Avatar
1969 29' Ambassador
brooksville , Florida
Join Date: Nov 2008
Posts: 1,270
The pics did not post.

Most new 12 vlt pumps have a built in pressure shut off switch. When pressure drops to a set amount it turns on, when it rises to x amount it turns off. Not sure about your set up, but I use a relay and the switch on my control panel to power on and off. Some older units had a air pump that would pressurize the fresh water holding tank. Me I would belly up the money and put a new one in. Less worry and hassle,
Not all those who wonder are lost.
Silverflames is offline   Reply With Quote
Old 04-23-2013, 08:58 PM   #4
Rivet Master
TG Twinkie's Avatar
1974 Argosy 26
Morrill , Nebraska
Join Date: Nov 2009
Posts: 5,996
Images: 2
Blog Entries: 5
The pump you have is a PAR pump. They were a good pump and some can be rebuilt.
There is usually a pressure switch wired to the pump that has preset
ON and OFF limits. When the pressure drops below the lower preset level the pump will start. When the preset pressure rises to the upper preset level the pump will stop.
If the wires on the pump are RED and BLACK, Red is positive and Black is negative.
TG Twinkie is offline   Reply With Quote

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

Featured Campgrounds

Reviews provided by


This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.

All times are GMT -6. The time now is 11:34 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.