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Sealant for polyethylene fuel tank?
I'm looking for a sealant or kit to seal brass NPT inserts into a
polyethylene tank. This is a Kitfox header tank that has developed a leak at one of the inserts. I'm probably going to use Mogas that has ethanol additives. Any hints, tips, thoughts? Thanks, Rob |
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Sealant for polyethylene fuel tank?
On Mar 1, 12:55 am, "Rob Turk" wrote:
I'm looking for a sealant or kit to seal brass NPT inserts into a polyethylene tank. This is a Kitfox header tank that has developed a leak at one of the inserts. I'm probably going to use Mogas that has ethanol additives. Any hints, tips, thoughts? Thanks, Rob ProSeal ....... or the generic =? Take it to an RV shop and have the insert "welded" in? |
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Sealant for polyethylene fuel tank?
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Sealant for polyethylene fuel tank?
Dennis Fetters wrote:
wrote: On Mar 1, 12:55 am, "Rob Turk" wrote: I'm looking for a sealant or kit to seal brass NPT inserts into a polyethylene tank. This is a Kitfox header tank that has developed a leak at one of the inserts. I'm probably going to use Mogas that has ethanol additives. Any hints, tips, thoughts? Thanks, Rob Red high temperature silicon sealer. Local hardware store. Clean the threads with alcohol and apply sealer. Lasts forever. I'd check the label first. Last time I looked, it specifically excluded use near gasoline. The kinds I've seen will swell up & shed chunks into the fuel system. Charlie |
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Sealant for polyethylene fuel tank?
On Thu, 01 Mar 2007 20:37:38 GMT, Dennis Fetters
wrote: wrote: On Mar 1, 12:55 am, "Rob Turk" wrote: I'm looking for a sealant or kit to seal brass NPT inserts into a polyethylene tank. This is a Kitfox header tank that has developed a leak at one of the inserts. I'm probably going to use Mogas that has ethanol additives. Any hints, tips, thoughts? Thanks, Rob Red high temperature silicon sealer. Local hardware store. Clean the threads with alcohol and apply sealer. Lasts forever. Except RTV is NOT gasoline resistant. -- Posted via a free Usenet account from http://www.teranews.com |
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Sealant for polyethylene fuel tank?
clare at snyder.on.ca wrote Except RTV is NOT gasoline resistant. Right. How about some welding with a pencil torch, and some cut up strips of like plastic? The key is to keep the fitting hot enough so the strips of plastic stay melted onto it, and cools and hardens after the heat is taken away, and enough heat is also applied to the tank plastic and the strips so that they toughly melt together. It is a fine line, getting the tank hot enough to soften, but not melt through. The other option that comes to mind is a fitting that is a plate with threads in it for the fuel line fitting, installed inside the tank and another plate on the outside the tank, with a gasket on both sides, and screws holding them all together. That could be done second, if the dreaded melt-through happened around the fitting. This could be manufactured at home, if one was a bit handy, and creative. -- Jim in NC |
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Sealant for polyethylene fuel tank?
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#8
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Sealant for polyethylene fuel tank?
Rob said his tank had developed a leak. That would mean that there had
been gasoline in the tank. I don't think anyone would suggest welding a used metal tank, how could it be any safer with a plasic one? Steve in Michigan On Thu, 1 Mar 2007 22:30:32 -0500, "Morgans" wrote: clare at snyder.on.ca wrote Except RTV is NOT gasoline resistant. Right. How about some welding with a pencil torch, and some cut up strips of like plastic? The key is to keep the fitting hot enough so the strips of plastic stay melted onto it, and cools and hardens after the heat is taken away, and enough heat is also applied to the tank plastic and the strips so that they toughly melt together. It is a fine line, getting the tank hot enough to soften, but not melt through. The other option that comes to mind is a fitting that is a plate with threads in it for the fuel line fitting, installed inside the tank and another plate on the outside the tank, with a gasket on both sides, and screws holding them all together. That could be done second, if the dreaded melt-through happened around the fitting. This could be manufactured at home, if one was a bit handy, and creative. |
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Sealant for polyethylene fuel tank?
"Earl" wrote in message
... Rob said his tank had developed a leak. That would mean that there had been gasoline in the tank. I don't think anyone would suggest welding a used metal tank, how could it be any safer with a plasic one? Steve in Michigan You got it ;-) I like flying, but not *that* kind flight... Rob |
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Sealant for polyethylene fuel tank?
Charlie wrote:
Dennis Fetters wrote: wrote: On Mar 1, 12:55 am, "Rob Turk" wrote: I'm looking for a sealant or kit to seal brass NPT inserts into a polyethylene tank. This is a Kitfox header tank that has developed a leak at one of the inserts. I'm probably going to use Mogas that has ethanol additives. Any hints, tips, thoughts? Thanks, Rob Red high temperature silicon sealer. Local hardware store. Clean the threads with alcohol and apply sealer. Lasts forever. I'd check the label first. Last time I looked, it specifically excluded use near gasoline. The kinds I've seen will swell up & shed chunks into the fuel system. Charlie Correct Charlie. But you never use any sealant in an amount that will transfer product into the tank. Problem: The fellow has a polyethylene tank, which nothing likes to stick to anyway. Add to that, it has fuel and maybe even oil in the tank, making it worse. Can't use a sealant that hardens, it will crack and leak. Solution: Use RTV in a small amount on only the threads of the insert after cleaning both the male and female parts. Install the insert so none of the RTV goes into the tank. Allow the gas to swell the RTV inside the threads, which helps the seal. Right, it has drawbacks if not used correctly, but it is the only good solution for the situation. The only other solution would be to ream the hole out and replace the threaded insert with a Dapco rubber bushing and insert, better anyway. You can find them at Aircraft Spruce. Hope this helps. |
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