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It's likley to be the rubber seal on regulator itself, the leak will be apparent as you screw the cannister into position. Coleman recommend returning the system to one of there authorised outlets for repairs. I have not seen parts for the regulator component sold seperately for DIY fitting.
If the holes are small, a dab of rubber cement on the holes may be sufficient to seal them. Larger holes will require a patch of the same or similar material as the mattress itself.
To properly adhere a patch, roughen up the mating surfaces of the mattress and the patch. Sandpaper is ideal. Be sure the mating surfaces are clean and free of dust. Apply rubber cement to the patch and apply it over the hold. Apply pressure to the patch using weights (a stack of books work great). Let the repair sit this way for the duration of the time required for the cement to set up according to the instructions on the cement.
Buy a new one. do not attempt to use this one again. There could be a pin hole in the propane lines or just a small crack. If you can hear it then there's a problem.
However if you really want to fix this one try putting water on the propane lines and then putting on a new tank and opening the valve. DO NOT LIGHT THE STOVE. where there are bubbles there is your leak. When you find it seal it with a Flame retardent sealent or clamp the line. Also I believe Lowe's sells parts that may work. just find out which line is leaking and replace the whole line.
I highly recommend just buying a new one and destroying the old one. DO NOT just throw it away please. Some one out there will grab it and try and use it. They will find out the hard way and maybe get hurt badly themselves or hurt someone else. Just imagine the guy who grabs it and goes camping with his family. Him and his son start it up. the son is right next to the unit. The guy fires it up and boom the son gets burned. Is it just me or would you feel bad if you knew this guy. I have seen it first hand. trust me it sucks. A buddy of mine did this and his son was in hospital for 3 days. he said he will never do that again.
So for safety sake please just buy the new one. don't take unnessecary risks if you don't have too.
If it leaks while filling it is likely any of the several fittings or it may be the 3 port check valve attached to the incomming water line. These are routinely installed backward. The idea is that when hooked to an external water supply the water goes only to the faucet and when using the tank, water can only go from the tank to the faucet. You cannot be hooked to external water and use the tank.
Any cracks in the tank should be obvious.
Use teflon plumbers tape on all screw fittings or will leak for sure. Hose clamps are also a necessity.