Favorite method for cleaning gas tank?

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Favorite method for cleaning gas tank?

Postby Grahamcracker » Wed Sep 12, 2012 2:12 pm

Need to clean all the sediment out of my tank, no rust or anything, just some chunkies that I don't want going through my carb and so on...

What's your favorite method for a light cleaning like this?
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Re: Favorite method for cleaning gas tank?

Postby spiderwebb » Wed Sep 12, 2012 2:23 pm

strait gas
remove tap if you can
compressed air when done
you can add nuts and bolts too to agitate a bit
shake and empty into lawn mower / leaf blower
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Re: Favorite method for cleaning gas tank?

Postby joe » Wed Sep 12, 2012 2:56 pm

pull the tank first. can be tricky with an oil tank on top.

pretty impossible to do it in the bike, unless you have some sort of skinny vacuum. I suppose you could syphon/pump the gas out and move a paper towel around the bottom with a tap wrench, but you won't get it all.
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Re: Favorite method for cleaning gas tank?

Postby Gearless42 » Wed Sep 12, 2012 3:40 pm

I have a compressor powered air amplifier that could remove debris from your tank without pulling it. Just need to drain the gas. Are you coming to town before the rally?
If you keep fiddling with it, it's going to fall off...
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Re: Favorite method for cleaning gas tank?

Postby joe » Wed Sep 12, 2012 3:44 pm

Gearless42 wrote:I have a compressor powered air amplifier that could remove debris from your tank without pulling it. Just need to drain the gas. Are you coming to town before the rally?


rather than just running it out of gas, as it may suck unwanted crap into your carb, use a hand pump to syphon. I have one you can use, or get one at harbor freight for $8.00
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Re: Favorite method for cleaning gas tank?

Postby Grahamcracker » Thu Sep 13, 2012 9:16 am

Got the tank cleaned, used acetone and some screws. Left the tank out overnight to make sure there were no leaks. But I can tell that it is going to be very difficult to get the gas line reconnected, it is a very short line. Thinking about replacing it with a slightly longer one. Anything specific I should replace it with?
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Re: Favorite method for cleaning gas tank?

Postby Gearless42 » Thu Sep 13, 2012 9:43 am

you can end up messing with your fuel flow if you make it longer. It is usually pretty easy to attach if you hook the line to the tank first. Then run the line through the body. Install tank. Last hook the fuel line to the carb.
If you keep fiddling with it, it's going to fall off...
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Re: Favorite method for cleaning gas tank?

Postby Dave » Thu Sep 13, 2012 11:31 am

Gas line creates back pressure if it is over 24 1/2 inches for the average vespa P, I would assume that similar nasties occure with copies. So dont mess with it, follow Landons advise
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Re: Favorite method for cleaning gas tank?

Postby Tuna Cowboy » Thu Sep 13, 2012 4:51 pm

definitely disconnect the hose from the carb. keeping that line as short as possible will help it run better, especially when the tank gets really low, like 'hoping to make it to the gas station' low, but still helps when you are on reserve.
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Re: Favorite method for cleaning gas tank?

Postby Miguel » Thu Sep 13, 2012 6:16 pm

If it is going to be hard to replace it with a short hose install a longer hose and cut off the excess when you are hooking it up to the carb. Just an idea
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Re: Favorite method for cleaning gas tank?

Postby Grahamcracker » Thu Sep 13, 2012 9:34 pm

I'm aware of the long gas line issues, but this one was impressively short. Managed to get it to work by disconnecting it from the carb, I was too drunk last night for any problem solving capabilities unfortunately...

Thanks for the help and advice, tank is installed and is cleanish enough.
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Re: Favorite method for cleaning gas tank?

Postby jeffreyned » Fri Sep 14, 2012 7:22 am

Grahamcracker wrote:I'm aware of the long gas line issues, but this one was impressively short. Managed to get it to work by disconnecting it from the carb, I was too drunk last night for any problem solving capabilities unfortunately...

Thanks for the help and advice, tank is installed and is cleanish enough.

:lol: Happy to hear it Graham. I've had mine out of the P a few times. It's not too big of a deal if it's the right length. Dave did extensive real world research on this one. Measure it and make sure it's exact!

See you tomorrow!
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Re: Favorite method for cleaning gas tank?

Postby joe » Fri Sep 14, 2012 10:41 am

When I disconnect the fuel line, I do so at the tap because feeding back through the rubber grommets in the frame and airbox is dirty and not easy. Do use the grommets, chucking them can lead to other problems down the road. Wd40 helps move the fuel line through the grommets too. Plus, by connecting the line back to the tap gives you another opportunity to ensure the clamp is tightened properly. Clamps do vibrate loose.
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