Lowest inch while draining fresh water tank - Fiberglass RV

Thread Tools Search this Thread Display Modes
Old 10-12-2009, 07:46 PM   #1
Trailer: Biggar 19 ft
Posts: 32
Draining the fresh water tank with the water pump leaves about just over an inch of water in the fresh water tank.

The hoses connected to it seem to be held on with both a metal strip that screws tight, and glue.

I thought I would take off a hose and use a hand pump to remove the final inch of water. But I would have to cut a hose.

Do I have to get it out? Gets pretty cold in Winnipeg.

If I do have to get it out, any suggestions?

Cory Lewis is offline   Reply With Quote
Old 10-12-2009, 08:03 PM   #2
Frederick L. Simson's Avatar
Name: Frederick
Trailer: Fiber Stream
Posts: 8,125
Send a message via AIM to Frederick L. Simson

Are you sure you don't have a direct drain from the bottom of your tank?

My Fiber Stream's fresh water tank has 4 connections, 2 near the top, (Water fill & air vent) and 2 near the bottom, (outlet to pump & tank drain). The tank drain drops from the absolute bottom of the tank through the floor to a line with a hose bibb valve.

Click image for larger version

Name:	000_0274.jpg
Views:	47
Size:	530.6 KB
ID:	24217

Can you see the short red pipe under the trailer with the hose bibb valve? That drains my Fresh water tank to the last drop.

Frederick - The Scaleman
1978 Fiber Stream 16 named "Eggstasy" & 1971 Compact Jr. named "Boomerang"
Frederick L. Simson is offline   Reply With Quote
Old 10-12-2009, 11:29 PM   #3
Trailer: Biggar 19 ft
Posts: 32
Thanks. Your answer made me go out and take a closer look. You were right, there was a fourth hole - but it wasn't on the bottom of the tank the way the tank was positioned.

In my Biggar, the freshwater tank was laying on its side under a couch. The fourth hole was higher than the hole leading to the pump but lower than the hole for inserting water and what I guess is the hole to the air vent. So the tank had to be taken out and tipped upside down to get the rest of the water out. The tubes were not glued on. They connected to plugs that screwed into the tank. Unscrewing them worked worked to free up the tank. More elbow grease to pull the tubes off of the plugs might also have worked. The fourth hole looks like it originally was about two inches in diameter and screwed, but at some point had been melted or glued shut and the replacement seems to be a tiny hole with a metal screw with a rubber washer.

Once the tank was off, I could stick one end of a tube into the tube that led to the pump and the other end into the non-toxic antifreeze container, then let the pump move the anti-freeze through the system.

Don't know whether all biggars were made as mine is or whether my set up is some modification by a prior owner.

Thanks again for your help!
Cory Lewis 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Sanitizing the Fresh Water Tank Jane P. Care and Feeding of Molded Fiberglass Trailers 3 02-16-2010 09:56 PM
2nd Fresh Water Tank Matthew A Plumbing | Systems and Fixtures 7 02-04-2010 11:07 PM
Trouble adding water to a fresh water tank Dan Tracy Problem Solving | Owners Helping Owners 1 05-05-2008 08:11 PM
Fresh Water Tank Information/Help Legacy Posts Modifications, Alterations and Updates 5 07-23-2003 11:10 PM
2nd Fresh Water Tank Christi V. Modifications, Alterations and Updates 0 12-31-1969 07:00 PM

» Upcoming Events
No events scheduled in
the next 465 days.
» Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:08 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.