Reply
 
Thread Tools Search this Thread Display Modes
 
Old 10-12-2023, 11:49 AM   #1
Ensign
 
Join Date: Oct 2023
Location: Montenegro
Posts: 2
Default maxum 2300SCR water tank air exhaust issue

Hello.
there is a liitle problem with my water tank.
filling pipe is placed about 2/3 of tank height, and seems there is no any air outlet valve. So i cant fill full tank, because there is no way out for the air.
May be there is a "secret" valve which i hadnt found?
__________________

baza1978 is offline   Reply With Quote
Old 10-12-2023, 06:22 PM   #2
Lt. Commander
 
Join Date: Mar 2017
Posts: 105
Default

Thatís odd. Every boat Iíve had experience with has a small air vent line on the tank that extends to a thruhull vent. Usually the tank vent is located next to the fill cap.

Iím this pic you can see the fill port in blue and the vent circled in red.
Click image for larger version

Name:	IMG_6278.jpg
Views:	5
Size:	410.8 KB
ID:	7628


Sent from my iPhone using Tapatalk
__________________

yahoo82 is offline   Reply With Quote
Old 10-12-2023, 06:53 PM   #3
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,065
Default

I suspect there is a vent as without one the system would make it difficult to fill the tank but worse vacuum lock as water is drawn from the tank by the pump. The vent allows air in as the water is removed to prevent a vacuum. Are you filling the tank from the deck plate or trying to use the threaded hose attachment. If the later that doesn’t fill the tank as it has a check valve in the system to just provide water bypassing the pump.
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2

Mike
mmwjr is offline   Reply With Quote
Old 10-26-2023, 02:02 PM   #4
Moderator

 
shrew's Avatar
 
Join Date: Apr 2008
Posts: 5,567
Default

The fuel tank, water tank and holding tanks all have vent lines. The vent line is connected to a small through hull which is typically located fairly high above the water line. Higher than any water discharge, typically.

The vent through hulls are very small. Yours is clogged. There are typically three causes for clogs in the vent line.

1) There may be a low level loop that is trapping fluid. The vent line should have a loop that goes ABOVE the through hull. This ensures that any external water flows back out the through hull rather than into the tank. If there is a trap, air won't pass.

2) The vent throughhull has a screen which prevents bugs like muddaubbers or yellowjackets from building nests. This screen is aluminum and prone to corrosion over time. The screen or the through hull vent itself may likely need to be replaced.

3) bugs like muddaubbers have built a nest in the vent through hull.

Locate the vent line on the top of the water tank and follow it. Inspect the vent line for blockages. If no blockages, remove it from the through hull and then attempt to fill the tank. If it fills, it's the through hull itself.

This is a very common issue causing fill issues with water, and fuel and pump out issues with holding tanks.
shrew is offline   Reply With Quote
Reply

« Fuel intake | - »
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


Powered by vBadvanced CMPS v3.2.3

All times are GMT. The time now is 10:23 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2023, vBulletin Solutions, Inc.