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  OUTRAGE: Modificaton to Central Fuel Tank Cavity

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Author Topic:   OUTRAGE: Modificaton to Central Fuel Tank Cavity
will posted 08-25-2008 09:45 AM ET (US)   Profile for will  
This winter I am planning on repairing the floor and replacing the fuel tank and fuel hoses on my 1991 Outrage. I know many on this site have done these jobs as well. What else should I do to the boat while the console, seating and floor is out of it? Any tricks you guys have come up with that make the boat easier to maintain after doing this job? Thank You - Will
dino54904 posted 08-25-2008 10:38 AM ET (US)     Profile for dino54904  Send Email to dino54904     
Hi Will,

I torn apart my 1972 19' Outrage two winters ago. There are two concerns that came up: Do you reseat the tank in foam; how do you keep water from entering and settling in the tank cavity.

I did not use foam. Rather, I afixed 1/2-inch thick and about 4-inch wide slats of Starboard laterally to the bottom of the cavity with 5200. I placed these about every 10-inches. I then placed the tank on top of these slats and put 1/2-inch pieces of Starboard in the fore and aft gaps and the port and starboard gaps. I thought that the foam, when wet, stays wet and will cause problems in the future. Using the Starboard allows water to drain to the bottom of the cavity and allows some air to circulate around the tank.

The cavity on my Outrage left no place for water to drain in the event that water entered the cavity. So, I created a sump at the aft portion of the cavity. I used a 6-inch hole saw and cut through the inner fiberglass surface and foam hull core. Then I cut a few 6-inch round pieces of fiberglass matte to build up the outer hull surface from the inside of the sump to about 1/2" thick. I also use fiberglass matte to cover the exposed foam on the inside surfaces of hole I cut. I then installed a garboard drain in the sump so I could check for water and drain any if needed. When I store the boat in winter I remove the garboard drain plug and the pry-out plate covering the fuel fitting that is in the cockpit floor right behind the console. That lets air circulate around the tank and throughout the tank cavity during the winter.

While I resealed the hatch over the tank well and replaced the pry-out plate with a new one I still figured that water will find a way into the fuel tank cavity some way. That is why I build provisions for checking, draining and drying water that may end up there.

Good luck!

Dino

will posted 08-25-2008 11:27 AM ET (US)     Profile for will    
Dino, I think that my tank is bolted in, not foamed in; someone please correct me if I am wrong. I like your idea about being able to get any water that settles in there out. Did you consider putting a bilge pump in or would that have taken too much room? Thank you for your reply. Will
Casco Bay Outrage posted 08-25-2008 11:41 AM ET (US)     Profile for Casco Bay Outrage  Send Email to Casco Bay Outrage     
Will--The tank will have a few straps on the top that are attached the the top edge. These are the only fasteners.

While Dino's sump is one method, I would recommend Jeff Rolfling's technique of adding a bilge tube with strainer in the aft section, attached to the back wall and use a primeless pump. This skips cutting into the foam etc.

Check out photo #51 here: http://continuouswave.com/whaler/reference/outrageRestore2.html


dino54904 posted 08-25-2008 12:35 PM ET (US)     Profile for dino54904  Send Email to dino54904     
Hi Will,

There was not room to install a bilge pump and if there had it would have been sealed in so well that if something ever happened to it that needed repair I would have had to dismantle the entire tank hatch and remove the tank to get at it. I considered installing a tube and bilge pump from the tank cavity to the bilge but elected the more passive system I installed because I thought it would accomplish the task in a simpler manner.

Dino

jimh posted 08-27-2008 08:53 AM ET (US)     Profile for jimh  Send Email to jimh     
Are any photographs available showing the details of the garboard drain plug and modifications to the hull structure?
Buckda posted 08-27-2008 09:11 AM ET (US)     Profile for Buckda  Send Email to Buckda     
The size of your 1991 Outrage will determine, to a certain extent, what you will need to - or be able to - do. For instance, the 18' Outrage's tank fits in the belly cavity with much closer tolerances than the 77 gallon tank in the 22' Outrage. (i.e. there is less foam around the tank)

I recommend you closely inspect the gelcoat/fiberglass in the rigging tunnels for deterioration, chips, etc and fix any you find.

If I were re-replacing the floor on my Outrage (i.e., if I had it to do over again), I would have changed the lay-up schedule of the plywood backing and added a 1/4" sheet of aluminum plate under the general areas for the leaning post and the console, so i could drill and tap screw holes to better anchor those components. I would also "build" the thickness where the perimeter screws attach the deck to the hull with fiberglass only, no wood. Then I would come back in from behind, and put an epoxy only plug behind each hole. When installing the deck again, I'd drill and tap that epoxy plug. This should eliminate the source of rot on the perimeter. Likewise, I'd overdrill the holes in the hull where those perimeter screws attached, and plug them with an epoxy plug. Once the deck is in place, drill and tap through the deck and into the hull and install the bolt to hld the deck down.

Some things to think about.

Personally, I'd re-foam the tank like Whaler did it, and just be vigilant to keep the area dry when the boat isn't in use (i.e. open the deck plates in storage).

Dave

jross036 posted 08-27-2008 04:37 PM ET (US)     Profile for jross036  Send Email to jross036     
I just installed a new FMT tank into an 18' Guardian. The original deck was beyond repair so we used 1/2" good marine ply, glassed both sides with bi-directional (aka stitchmat) ran a 3" pvc under there and re foamed it in. With a new tank I felt the need to ever go back in wasn't going to be likely, versus the chance of water intrusion. Beckson screw type of inspection ports went down on the 2 spots, then carved the foam out inside these and epoxied it around down to the top of tank. Only moisture we get is condensation ( Hawaiian weather) Leave boat with inspection ports open when parked on TRAILER,not in the water . No problems. Keep in mind this boat started its life in Pearl Harbor getting abused in every possible way, so we didn't have much to work with to restore.There was so much deck damage that it couldn't be used again.You can email me for a ph.# for more details and some pics.
pandrewt posted 09-03-2008 02:39 PM ET (US)     Profile for pandrewt  Send Email to pandrewt     
Dino, what were the dimensions of the tank? Did you replace your tank? If so, where did you find the new one? Any pictures of the project would be appreciated. Phil.

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