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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Correct process to repair (weld) fuel tank on JD45

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Wayne02

06-26-2006 11:21:54




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Fuel tank has leak somewhere. Will need to remove tank to locate leak, but suspect it is near the bottom on one of the welds. Tank has been dry for years (all leaked out).

I can weld up a split or hole easy enough but want to make sure I do it safely. Do I flush the tank with water a few times. Fill the tank with water while welding??

Thanks
Wayne




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Grub0927

06-27-2006 10:08:38




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 Re: Correct process to repair (weld) fuel tank on in reply to Wayne02, 06-26-2006 11:21:54  
Don't know how large your defect is but I had success repairing holes in a pickup fuel tank using a Permatex putty that I bought at the auto parts store.
Whatever method you use it will be subject to vibrations again so be sure it is secure to control the motion.

Grub



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teighs

06-27-2006 04:23:06




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 Re: Correct process to repair (weld) fuel tank on in reply to Wayne02, 06-26-2006 11:21:54  
Chunks of dry ice, (frozen CO2) in the tank. When they melt they will release CO2 gas.



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seann

06-26-2006 20:38:30




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 Re: Correct process to repair (weld) fuel tank on in reply to Wayne02, 06-26-2006 11:21:54  
Welding on a fuel tank can be extremely dangerous, there's a fair number of folks killed every year from tanks blowing up on them. From what I've heard there's only a few truly safe ways to do this. Probably the best method is to use soap and water to flush it out, then fill it with water almost all the way, but leave just enough airspace for the weld (after the tank is turned upside down so you can weld on the bracket). This prevents enough oxygen and fuel building up in the tank to cause an explosion. Sometimes an inert gas, like pressurized CO2 or nitrogen is continually pumped in to purge the tank of air (i.e. oxygen) and then it's welded on that way. I've heard other stories of piping in exhaust from a poorly tuned motor into the tank etc etc, but these are not nearly safe enough in my opinion. This is the most serious of business, don't take chances. And I most certainly would NOT use compressed air as the filler gas either. Almost no matter how much you rinse the tank there will probably be some residual fumes left, plus there's the possibility explosive gases from the torch itself will build up in that big airspace too. These fumes mixed with abundant oxygen (provided by the compressed air) and fire from your torch can end your life in an instant.

Good luck and be careful!

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mark ace

06-26-2006 20:06:50




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 Re: Correct process to repair (weld) fuel tank on in reply to Wayne02, 06-26-2006 11:21:54  
ive done this before, id remove it flush with water & then stick a air hose on a regulator in the tank, turn press down and weld! rinse water with diesel & let air dry !



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