Hole in plastic fuel tank Hole in plastic fuel tank
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    Hole in plastic fuel tank
from jdw #10274  
6/21/2008 9:18:18 PM

Rated:

 I drilled a hole in my plastic fuel. I see absoulutely no way to remove tank. Can I use a screw and neopreme washer and then epoxy over every thing? I would need to use a #14 screw for the hole.


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   Might work from LLB #13179  6/21/2008 9:46:45 PM
 I assume the hole is in the top of the tank, it might work if you can find an epoxy that is oil and fuel resistant and will stick to the plastic. It could be a safety issue if it leaks and would not be Coast Guard approved. I would not recommend it to one of my customers But it is your boat and your skin, if you do it monitor it closely for leaks. And NO SMOKING IN THE BOAT!


   Your approach seems reasonable from Randy B  6/21/2008 10:21:41 PM
 esp if the plastic is thick so that the screw really gets a grip.


I've heard of plastic welding also, but I don't know how that would work with gas fumes (and gas presumably) in the tank. I don't think a flame is involved, but a lot of heat is. A motorcycle plastic fuel tank repair website says "we use a good quality plastic welder and plastic welding rods. The tool blows about 3 to 4 psi of air heated to the melting point of the plastic. The plastic rod is fed into the prepped and cleaned damaged area of the bodywork. The welder is used to melt the rod to the damaged part and the plastic fuses together for a super strong repair. This process is very similar top metal welding with metal rods, just using different materials". Some guys on here plastic weld.


If you don't plastic weld it, I think you ought to research the best material to use. I saw some websites about this. One recommended fiberglass & resin. Also, mentioned JB Weld for plastics. Another said that "Power Poxy Plastic Bonder Pro Series #21801 (www.powerpoxy.com)" was gasoline resistant but not advertised that way due to liability issues.


A plastics expert says "There are some "glues" on the market that work with Polyethylene and Polypropylene, ... Try 3M Scotch-Grip Plastic Adhesives 4693 or 4693H or the super glue product called "Future Glue"".


Another expert recommended urethane (he said that www.bjbenterprises.com sells a small quantity of urethane in a paste form). I couldn't find which one he was talking about, but you could call them. I think he was talking about thermoset polyurethane.


In any case, you want to clean and rough up the plastic. Get it good & dry. One last idea, you might have a stronger result if you actually drilled 1-2 more holes and used multiple screws to have more "grip".


Good luck & be careful.



   Man I'd go to LOWES or HomeDepot and from The perchjerker  6/21/2008 10:44:53 PM
 buy a tube of MARINE GOOP.That stuff is like clear silicone and drieds hard after it cures.Just make sure you prep the area around the hole(clean and sand it).


   Marine Goop from jdw #10274  6/21/2008 11:06:51 PM
 According to their tech sheets gasoline is a solvent even after it has hardened


   I'd use a pop rivet rather than a screw from livinforfishin #10330  6/22/2008 12:26:34 AM
 Use a pop rivet and then the epoxy.


   weld it from MikeF  6/22/2008 8:03:25 AM
 How's that for a scary idea. LOL


Actually the tank is probably made out of HDPE. There's almost nothing that will permantly stick to it. But kayaks and dirtbike fuel tanks are made of the same thing. You can buy sticks of HDPE that you can melt into the hole to permantly fix it. But you would have to TOTALLY get all of the gas and vapors out of the tank before you do it.


The proper way to fix it is to take the tank out and rinse it out and dry it and then take it to any good kayak shop and they can fix it in a heartbeat.


Or you could buy a stick of the material and try it yourself. You either need a commercial heatgun or a widetip HD soldering iron. But if you're not careful you can melt right through the tank.


If there's any fuel in the tank when you try this you will blow up your boat.


Do a google on repairing kayaks and you'll see how it's done.


   the screw and neoprene is sounding better all the time from Randy B  6/22/2008 11:15:30 AM
 neoprene is good with gasoline (per an engineering website).


After the hole is closed up, it seems like it gets a little safer. What if you used one of those gluestick guns? It wouldn't put off much heat and I think you could seal it.


Okay, here's what I'd do. Try to find a screw with a built-in washer - the bigger diameter then better. If you find one with a lip or edge that would capture some glue, that's even better.


Then, get a neoprene o-ring that's not much bigger than the screw threads. Sand the area clean and flat (esp where the o-ring will touch).


Start the screw and get the o-ring touching the tank (but the screw not tightened). Then, use the glue-gun to create a continuous ring of melted gun under the head of the screw and up against the o-ring. Then, tighten the screw to compress the o-ring and form the melted glue. Smooth the melted glue with a popsicle stick to form a nice bond with the adjacent plastic.


I bet that would work.


   epoxy from jdw #10274  6/22/2008 12:08:44 PM
 Same screw and washer idea with oversized washer but instead of hot glue use bead of two part epoxy on outer ring of washer which squeses out when tighten down and then build second layer over screw


   not HDPE from BCB  6/23/2008 4:31:02 PM
 The tanks are made of Polyolefin Fibers and not HDPE. The polyolefin was first developed by Phillips 66 and is also the similar material your carpet your made out of.


You will not be able to plastic weld it as it is a cross linked plastic. You may be able to put a screw in it or plug it with adhesive and a screw, though we could not suggest that and there could be liability concerns.


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   in that case from MikeF  6/23/2008 5:53:46 PM
  If it's polyolefin instead of polyethylene; then this stuff should work. http://www.masterbond.com/tds/x17hv.html

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