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Author Topic:   25" Revenge 1981 Water on top of fuel tank
bob1008 posted 09-16-2002 08:58 PM ET (US)   Profile for bob1008   Send Email to bob1008  
After heavy rain I noticed water puddling on top of my aft fuel tank (saw this thru the see-thru deck plate arounfd the fuel gauge). After pumping out bilge the water immediately drained out. I was under the impression the fuel compartment was sealed off from the bilge and baitwell. I generally leave my bilge pumps off so I don't get dead batteries, as I check boat after every rain. Any recommendations as to drying out this area and keeping water out in the future?
lhg posted 09-16-2002 09:06 PM ET (US)     Profile for lhg    
Leave both stern sump plugs out when the boat is not in use. You will never have the water rise above the level of the bulkhead, and no water will get into tank area. On some warm sunny days, open up all floor plates so the tank area can dry out by evaporation.

The tank area is NOT sealed off from the bilge and some water can get in there. It can mostly be avoided if you don't let water back up on the floor. Uncovered, moored or docked Outrages should always be left with the plugs out in the stern, and bilge pumps deactivated. They ARE self bailing.

bob1008 posted 09-16-2002 09:37 PM ET (US)     Profile for bob1008  Send Email to bob1008     
Thanks lhg,
I usually leave the bottom plug in as I have always been afraid to leave it out. Are you certain that my 25' REVENGE is also self bailing? The water must enter from the bilge because as soon as I started to pump the bilge the water drained off of the top of the fuel tank. Thanks very much for your help.
lhg posted 09-17-2002 05:50 PM ET (US)     Profile for lhg    
Absolutely sure, unless your hull is BADLY waterlogged! If anything, the 25 Revenge will be more self bailing, since because of the cabin shell weight forward, the stern will sit higher in the water, hence even more self-bailing.
jimh posted 09-17-2002 08:27 PM ET (US)     Profile for jimh  Send Email to jimh     
What happened in the initially described situation:

Water collected in the cockpit and drained into the bilge sump. The pump was off. Eventually enough water collected into the bilge sump to begin to fill the rigging tunnel running forward.

Once the water rose to the point where it reached the fuel lines, it flowed through the bulkhead between the sump/rigging tunnel and the fuel tank cavity via the holes in the bulkhead that admit the fuel lines. Water began filling the central fuel tank cavity, which was soon seen through the access plate.

bob1008 posted 09-17-2002 09:23 PM ET (US)     Profile for bob1008  Send Email to bob1008     
jimh and lhg,
Now I get it. I really want to thank you for taking the time to explain this to me. I now understand what occured, and what I must do to keep the fuel compartment as dry as possible. I have bilge pumps both in the rear sump, and in the rigging tunnel. From now on my plan is as follows:

a) Both rear plugs left "out".
b) Bilge pump in rear sump left "off"
c) Bilge pump in rigging tunnel left "on"

Any comments are greatfully welcomed. Thanks again!

bob1008 posted 09-18-2002 08:23 PM ET (US)     Profile for bob1008  Send Email to bob1008     
Ok fellas. Just a couple more questions.. Today I went down to the boat and removed the plug in the rear sump. It immediately filled up to about 3" - 4" from the top. Is this about the normal level before self bailing takes place ? Should the plug be put in every time I get underway and the water bails out? Or does the plug just stay out all the time? I'm thinking the plug should probably be left out just when docked for an extended period and the bilge pump is left off..correct? Thanks again.
Arriba posted 09-18-2002 10:22 PM ET (US)     Profile for Arriba  Send Email to Arriba     
Just a little more info. I have a Revenge 20 fter and this past winter I took the fuel tank cover off to clean it out and do what needed. Whew. The fuel vent hose was not alcohol resistant, leaking, changed that. There was water and dampness on the tank and the surrounding edges of marine plywood. It was a mess. The water that got in thru the gas guage view hole couldn't drain out due to the sections of wood across the tank. I cleaned up the aluminum tank prepared the metal, primed and painted with zinc chromate (not sure of name now).I left it open for three months to dry out inside my building. Then recaulked all around, changed vent hose, cleared drain tubes and put the cover back on sealed securely. I sealed the circular view hole for the manual gas guage so no water could get in there also. In the drain from the tank top to the sump pump area I close this off with a plug. The top of my tank is clean, dry and caulked. It is a job I will never have to do again and had not been done for 24 years. (1978 model)
bob1008 posted 09-19-2002 08:02 PM ET (US)     Profile for bob1008  Send Email to bob1008     
One question...what is that drain from the tank top to the sump area for? And is it wise to plug it up?
Arriba posted 09-24-2002 10:40 PM ET (US)     Profile for Arriba  Send Email to Arriba     
The drain to the sump pump area appeared to, in theory, drain any water that got in on the top off the tank. However, there are planks ( 2x2 ) of wood/metal across the tank beam to beam. They help secure the tank, but did a lousy job of letting any water that got in run down to drain into the sump pump area. All they did was keep everything wet. I really believe that the tank area is dry and will remain that way. however, I did leave it so I could unplug the drain if I ever needed to
bob1008 posted 09-25-2002 08:17 PM ET (US)     Profile for bob1008  Send Email to bob1008     
If I do leave the plug out in the sump area to take advantage of the self bailing feature, won't the water level get high enough to enter this drain to the top of the battery ? I havn't pulled the plug on the sump tunnel yet because I hate to let all the cables, wires, and lines sit in the water for long periods of time. Any comments are appreciated.
Arriba posted 09-28-2002 10:07 PM ET (US)     Profile for Arriba  Send Email to Arriba     
I have a seat in the stern, port to starboard, sitting on a ledge fully port to starboard [i.e., the dam that separates the cockpit from the splash wel]. This ledge seperates the self bailing, battery area and baitwell [the splash well] from the cockpit. The water never gets to the cockpit. The [cockpit] sump area is forward of the ledge [the splash well dam] ( it is actually in the cockpit area ) and is not affected by any water coming in from the stern self bailing area [the splash well]. Only water in the cockpit area or getting over that seperator [splash well dam] is handled by the pump. The batteries stay dry in their baterry boxes on the port snd starboard sides in the self bailing area [the splash well] ( I have a spare battery for insurance). The drain from the tank I'm referring to drains into the sump area in the cockpit. [This is part that is difficult to understand as the depth of the fuel tank cavity is much greater than the depth of the cockpit sump, and water would have to flow uphill in order to 'drain" from the fuel tank cavity into the cockpit sump--jimh] No water gets to it. I have a Rule 1100 Platinum pump and the only time I have had water in the cockpit is when I wash it down and on those instances the plug to the tank area keeps it from entering that area. I keep the self bailer plug [in the splash well] out [and the splash well drains] stay slightly above the waterline. I have a 2002 150 Johnson on [the transom] and it appears just right for the self bailers [in other words the splash well drains remain above the waterline].
jimh posted 09-29-2002 07:12 PM ET (US)     Profile for jimh  Send Email to jimh     
I have taken the liberty of appending some remarks to Arriba's post to try to clarify his description.--jimh.
bob1008 posted 09-29-2002 10:19 PM ET (US)     Profile for bob1008  Send Email to bob1008     
If I leave the plugs out is there any risk/downside to always having the rigging tunnel partially full of salt water? Seems like not such a good thing...
Capt_Tidy posted 09-30-2002 04:11 PM ET (US)     Profile for Capt_Tidy  Send Email to Capt_Tidy     
I'm replacing the tank vents on my 25'Outrage and noted that water seems to sit in the little bilge area that runs from the side wall (port) where the tank hoses run. After heavy flushing these run dry now. Lots of stuff sitting around the hoses blocking the flow. Most leaves etc.

The hoses appear to run under the long tunnels/drains that run to the rear bilge. But water does drain fro mthis side bilge to the out the rear tunnel to the rear sump. From the little side bilge I can see a tunnel. It is 1/2 pipe shape. This maybe a dummy cover or something for wiring ?

So where does water in along side of the tanks drain actually to... are there parallel tunnels under the floor? I think wells are deep to drain into the tunnels.

Comments from those who have removed their tanks? A figure would be great.

Capt_Tidy posted 09-30-2002 04:22 PM ET (US)     Profile for Capt_Tidy  Send Email to Capt_Tidy     
My English sucks today... my little 4 month old boy keep me up all bloody night. Who needs teeth at that age anyway.
Arriba posted 09-30-2002 08:36 PM ET (US)     Profile for Arriba  Send Email to Arriba     
Thanks for putting what I was trying to say in really understandable language. You were right on the money

I'm done, I'll never take that tank cover off again.

Arriba posted 10-24-2002 01:55 PM ET (US)     Profile for Arriba  Send Email to Arriba     
jimh How do I access the appendage you added to explain properly what I meant?

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