Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 31-08-2015, 08:16   #1
Registered User
Jolly Roger's Avatar

Join Date: Oct 2006
Location: Cape Canaveral, Florida - for the moment
Boat: Down East 45, Brigantine
Posts: 964
Images: 1
Water gage conundrum ?

I have a water gage problem which has been driving me nuts for months, and I wonder if anyone with experience with pneumatic gages can throw some light on it.
I have two 150 gallon water tanks either side of the boat. The tank gages are air pressure operated, like the Tank Tender system, but older, circa 1977. The makers are long gone.
A simple 3/8” straight plastic tube, the depth of the tank, bolts into the top of the tank with a gasket and six screws. A 1/8” thin plastic pipe pushes in the top and goes to the gage where it pushes into a tube on the gage. The gages are made like a pocket watch, having a diaphragm and gears which activates the gage indicator as the water pressure varies.
One side works perfectly—when I fill up the tank the gage moves to full and decreases as the water is used. When the tank is empty the gage shows zero.
But when I drain and fill the tank on the other side the gage slowly moves to full, then drops off to zero within about an hour, but that varies a bit.
"Air leak" you say! Either in the plastic pipe or gage! but wait. I’ve installed new connecting pipe, which I pre-tested for cracks or leaks. I’ve also sealed all the joints in the tank tube with epoxy, including the connecting pipe joint.
Here’s the rub. If I swap the gages over, the good gage drops off to zero and the faulty side gage stays at full. So it’s not a faulty gage, right?
Also, when I submerge the faulty tube in the bath-tub at my home it records full, (with either gage), and stays full, the last test being a week in duration. There is absolutely no sign of air leaks in either the tank tube or the connecting pipe to the gage.
But the moment I screw it back in the top of the full tank, bingo! it drops off to zero within an hour, with either gage fitted .
I don’t want to change the system for a sight-glass or lever gage, because it doesn’t use any power and is really simple. One side works perfectly, so why doesn’t the other?
These sort of conundrums are frustrating, like intermittent electrical problems, so any thoughts would be much appreciated.
How to build a square rigger? Find out at
Member: Boating Writers International.
Also pages of sailboat items for sale
Jolly Roger is offline   Reply With Quote

rum, water

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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
Reasonable rig tension gage SvenG Deck hardware: Rigging, Sails & Hoisting 21 22-07-2015 10:37
Fresh water pump conundrum Greenhand Plumbing Systems and Fixtures 11 25-06-2015 16:24
Fuel Gage Pops Toy Powered Boats 1 27-06-2013 08:23
fuel filter vac gage markings Ecos Engines and Propulsion Systems 0 04-06-2013 14:40
Fuel Gage Repair Help svcattales Engines and Propulsion Systems 10 04-10-2008 11:31

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 17:36.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.