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 > What can I use to get water out of a gas tank

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opnspaces

San Diego Ca

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Posted: 03/07/20 10:32am Link  |  Quote  |  Print  |  Notify Moderator

The gas tank is out and sitting on the ground. I need to solder a fitting back on without blowing myself up. I've done this before by washing the tank out and letting it sit in the shed for a few days first. But I really would like to turn this repair around today. Any ideas how I can safely get a flame close to an empty gas tank?

I've thought about just filling it with water, but I fear the water would absorb the heat and make soldering impossible. If I wash the tank out, how can I get the residual water out before reinstalling? Would swirling a few bottles of 90% rubbing alcohol around in it do the trick? Can anybody think of something better to use, something that is fairly readily available off the shelf?


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Big Katuna

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Posted: 03/07/20 10:37am Link  |  Quote  |  Print  |  Notify Moderator

Get a small gas engine eg lawn mower, edger, etc. connect the muffler to a small flex pipe. Flex conduit is fine. Secure it into the opening of the tank. Start motor. Weld.

The CO from the motor pushes the o2 out so no explosion. Seen it done many times at the welding shop near where I grew up.


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fj12ryder

Platte City, MO

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Posted: 03/07/20 10:39am Link  |  Quote  |  Print  |  Notify Moderator

A friend of mine that did welding said the best way to deal with a gas tank is to wash it thoroughly 3 times, steam the inside twice, and then give it to someone else to deal with. [emoticon]


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ScottG

Bothell Wa.

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Posted: 03/07/20 10:44am Link  |  Quote  |  Print  |  Notify Moderator

For drying out a (car) tank, I used a shop vac to blow air into the tank. It naturally heats the air a little and after 45 minutes, it was bone dry.


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Lwiddis

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Posted: 03/07/20 10:51am Link  |  Quote  |  Print  |  Notify Moderator

And pray.


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bguy

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Posted: 03/07/20 11:41am Link  |  Quote  |  Print  |  Notify Moderator

We soldered with the tank full of water. A small bubble of space at the top won't let the water absorb all the heat or allow enough gasses to collect to be dangerous. The only thing special I recall doing was adding a few bottles of gas line antifreeze to absorb any residual water.


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2oldman

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Posted: 03/07/20 11:45am Link  |  Quote  |  Print  |  Notify Moderator

Perhaps you already did this:

Google: water out of gas tank.

TenOC

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Posted: 03/07/20 11:59am Link  |  Quote  |  Print  |  Notify Moderator

Get some dry ice at the grocery store crack in small pices and put in the tank. Dry ice is frozen CO2 so allow a few minentes for the ice to melt and fill the tank with CO2.


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opnspaces

San Diego Ca

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Posted: 03/07/20 12:08pm Link  |  Quote  |  Print  |  Notify Moderator

^ Of course, this is one of those "if it was a snake it would have bitten you" moments. I have my CO2 tank for inflating tires off road. I can jam the hose into the tank with a rag and wait for it to fill with Co2. It does make me nervous though even knowing that Co2 is heavier than air and will fill the tank up. Science may tell me it's okay, but my self preservation mechanism is still screaming this is a bad idea. And I usually listen to that voice when it's this loud.

Johnny G1

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Posted: 03/07/20 12:10pm Link  |  Quote  |  Print  |  Notify Moderator

Big Katuna has it right, welded up many tanks that still had gas in them. would just run the vehicle and put an exhaust hose in the tank.


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