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Fixing a leaking gas tank

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Jeff`

08-28-2002 05:09:56




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I have a MF85 that started to leak gas on the bottom of the tank where it mounts over the battery box. I was planning on fixing it myself. Drain & remove the tank, flush the tank with diesel, drain again, use the air compressor & apply constant air to the remove fumes. Then was planning on cleaning the area very good & solder ( acid ) the bad seam. Does anyone have any words of advice to add??

Thanks
Jeff

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DougN

08-29-2002 20:27:03




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 Re: Fixing a leaking gas tank in reply to Jeff`, 08-28-2002 05:09:56  
Welding tanks, although dangerous is often needed. The trick most use is to thoroughly rinse the tank out then fill partially with water and add lots of dry ice. The dry ice gives off Carbon Dioxide, which being heavy, pushes out the lighter gasses and is inert(non volatile). After several minutes of dry ice treatment and while there is still plenty of dry ice in the tank it should be safe to apply the heat. This is not for the weak of heart nor the sloppy. I've yet to have a tank blow-up using this method, however, I can only recommend it as a last resort and it should only be done by a professional. Another possibly better option might be tank sealer like that found on....

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kjm

08-29-2002 19:24:05




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 Re: Fixing a leaking gas tank in reply to Jeff`, 08-28-2002 05:09:56  
If you weld the tank do not drain never weld an empty tank!!!!I won`t weld one my life is worth more than an old gas tank LOL kjm



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Country40

08-29-2002 19:51:40




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 Re: Re: Fixing a leaking gas tank in reply to kjm, 08-29-2002 19:24:05  
Try rubbing a bar of hand soap over the crack the soap will fill the crack from the outside to the inside and will stop the leak have stoped several on the older model cars hope this helps



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LeeJo

08-29-2002 18:37:51




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 Re: Fixing a leaking gas tank in reply to Jeff`, 08-28-2002 05:09:56  
Have never repaired a gas tank using torch or iron. Nor do I ever want to . Have repaired several tanks, small,large and some in very bad condition, using epoxy. can be purchased from JC Whitney . Also ads are in Gas Engine Magazine. Follow directions and buy the best around $29 per Qt.


429



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Mr.T

08-29-2002 15:55:25




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 Re: Fixing a leaking gas tank in reply to Jeff`, 08-28-2002 05:09:56  
Jeff,
I've had three experiences with welding/cutting tanks.
The first one was a motorcycle aluminum tank. It sat filled with water over a week end. It had about a qt of water in it when welded. It blew and peeled the seems back in the shape of a flower. No one was hurt.
The second one was with a 55 gal. drum. A Sgt. was cutting it in half to make a barbaque grill for the motor pool. It had been filled with water,drained then hooked to a Humv'S exhaust. It blew so hard it slammed the cutting torch into the Sgt. and broke his collar bone.
The third one was a cars gas tank. It had been filled with water and sat for two days. It was drained and set up against a radiator for a week to dry out. I heard a loud bang so I ran out to the shop and found the welder flat on his back with the torch still in his hand luckly it had been blown out.
DON'T WELD A TANK!

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Bernie

08-29-2002 15:20:47




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 Re: Fixing a leaking gas tank in reply to Jeff`, 08-28-2002 05:09:56  
In my oh so humble opinion there are some things in life best left to those who do it for a living... Fixing fuel tanks is one of those things! Take your tank to a fuel take repair facility and have them fix it. No worrys for you and they warranty their work. That's what I did with the tank from my TEA 20. Serviced, leak checked, and painted for around $60 CDN...

Cheers!



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dbrown

08-29-2002 06:44:04




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 Re: Fixing a leaking gas tank in reply to Jeff`, 08-28-2002 05:09:56  
Use exhaust from engine running aimed in tank while soldering.O2+fuel+spark= BOOM



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RHS

08-28-2002 10:06:15




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 Re: Fixing a leaking gas tank in reply to Jeff`, 08-28-2002 05:09:56  
Sounds good to me. Another way to ensure all fumes are removed is to fill tank with water, then drain and dry. Once you clean the tank, look closely on the inside of the tank, in the area of the leak. Is the area rusted or corroded? Make sure that the solder job is all you need. If the tank has deteriorated over a large area, you can pour epoxy inside and let it settle in the corroded area - after cleaning.

RHS

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J MOUNT

08-30-2002 06:23:21




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 Re: Re: Fixing a leaking gas tank in reply to RHS, 08-28-2002 10:06:15  
I HAVE FIXED SEVERAL TANKS, FIRST OF ALL FILL ABOUT ONE THIRD FULL WITH A GOOD SOAP AND WATER MIXTURE,SHAKE TANK FOR ABOUT 5 MINUTES LET SIT FOR 15 MINUTES SHAKE AGIN ,DRAIN TANK, RINCE OUT WITH HOT WATER THE HOTTER THE BETTER,LET SIT IN THE SUN AND DRY. SMELL THE INSIDE --IF IT STILL SMELLS LIKE FUEL REPEAT SAME PROCESS UNTILL NO FUMES ARE PRESENT. GOOD LUCK.



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