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anyway to repair fuel tank pinhole?

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Old 11-24-2005, 09:06 PM
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Desert Toad
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Default anyway to repair fuel tank pinhole?

Hi there,

My fuel tank has a very small pinhole in the rear seam that only leaks when it's pressurized (I can't get any air through it even if I blow into it). I'd really like to get a couple more weekends out of the plane before winter comes and I can remove the tank - it's going to be a big job! Is there anyway to patch this hole? I can reach it fairly well, but there is a lot of built up wood around it, which would be a big job to remove.

thanks,

DT
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Old 11-24-2005, 09:07 PM
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Default RE: anyway to repair fuel tank pinhole?

I've fixed them with a small low heat soldering iron like you would use for small electronics.
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Old 11-24-2005, 10:33 PM
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Desert Toad
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Default RE: anyway to repair fuel tank pinhole?

Oh, wow. Melt the seam back together! Great idea, worth a try for sure!

thanks,

DT

PS now it makes sense, read somebody fixed them with a milk carton, probably melted it into the hole. How carefull do I need to be so as not to melt the hole bigger?
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Old 11-24-2005, 11:44 PM
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Machinegun21
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Default RE: anyway to repair fuel tank pinhole?

If the Fuel tank is plastic and if the hole is about the size of a pin then i would just use this brand of epoxy called JB Weld and just put a thin layer of that over the hole and let it sit overnight and it should be good.
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Old 11-25-2005, 07:51 AM
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Default RE: anyway to repair fuel tank pinhole?

The following technique might not work and may make the situation worse since the leak is on a seam.

The fuel lines on weed eaters and such are simply pushed through a hole in the tank drilled smaller than the fuel line. I have never seen a leak at the fuel line.

Drill a hole and push a short section of fuel tubing through the hole. Put a dowel in the end of the fuel tubing.

Good luck.

Bill
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Old 11-25-2005, 09:56 AM
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Desert Toad
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Default RE: anyway to repair fuel tank pinhole?

Very familiar with JB weld, but why wouldn't regular epoxy work?

DT
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Old 11-25-2005, 04:05 PM
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Default RE: anyway to repair fuel tank pinhole?

I have not tried to fix holes with regular epoxy so i do not know how well it would work but i can't imagine that it would work any differently.
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Old 11-25-2005, 04:55 PM
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Default RE: anyway to repair fuel tank pinhole?

You may get by by just turning a small short sheet metal screw into the hole as a plug.
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Old 11-25-2005, 06:30 PM
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Default RE: anyway to repair fuel tank pinhole?

Epoxy will not stick to plastics. If air leaks through so has fuel. Jb weld might not hold good b/c of the oil in the fuel. Heat and fuel is not a good mix either. DO it the right way and replace it. It might be a big job and take longer than you want but think of the long term problems.
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Old 11-25-2005, 06:46 PM
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Default RE: anyway to repair fuel tank pinhole?

jb weld works well on fuel tanks. i repaired a hole in the tank of my rc boat with it and haven't had a problem yet...but asmithnc is right, just replace the tank, they're cheap and it will be a lot less work in the end.
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Old 11-25-2005, 08:52 PM
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Desert Toad
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Default RE: anyway to repair fuel tank pinhole?

Well I took a look, and it was easy to pull the tank, but now I need to figure out the right kind of tank for my YS engine. It seems the motor made way too much pressure for the cheap tank I had.

DT
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Old 11-26-2005, 03:47 AM
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Default RE: anyway to repair fuel tank pinhole?

I have used hayes tanks with great success with my YS engines. Second way more expensive by far is use a tettra tank from central hobbies. About 15.00 depending on the size. I've used both and had great success both ways. zero failure. I have also seen du-bro tanks used with YS engines and some have popped the stopper out. and some have worked great. may or may not be the assembler.
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