Stale gas gunk/residue in tank - Chicagoland Sportbikes
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post #1 of 8 (permalink) Old 09-09-2011, 01:00 PM Thread Starter
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Stale gas gunk/residue in tank

A friend brought me an old GS650 to fix up for him and the fuel tank had fuel in it for so long, that the gas was black when I poured it out, and left a thick tarry black (gas reverted back to oil) mess in tank. Since I cant submerge the entire tank in a vat of Mineral Spirits and wait for it to disolve, what other solutions are there?
Thinking about whacking the outside with a soft rubber mallet (to loosen up) then running garden hose from laundry room sink to outside the house and flush with hot water to help dissolve and loosen it up.
What else can I try? Pour a bottle of Janitor-in-a-drum or Simple Green in there and slosh it a around off and on over the weekend? Fill with Dawn dish liquid (degreaser) and water and let it sit?
The carbs were a mess, and spray carb cleaner, as well as soaking in mineral spirits for a few days cleared them up.

Ill line it (POR15) later, and dont want to line over the mess that is in there now.

Thanks!

Chicks dig guys with hippohands on their sportbikes.

Drew "Droopydawg" Mobley
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post #2 of 8 (permalink) Old 09-09-2011, 01:06 PM
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A few options here IMO:

1) Plug the petcock, fill it up with gas, let it sit for a day, drain, rinse, repeat
2) Same drill, but use something stronger -- spirits, degreaser, etc
3) Off the wall, but a pressure washer would knock it loose i imagine

Can always shake the tank up a bit too

Those are my ideas -- im sure there will be others

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post #3 of 8 (permalink) Old 09-09-2011, 03:44 PM
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NO WATER!!!!!! youll create a rust problem youll regret forever


fill the tank with a petroleum solvent and let it soak, swishing it around a few times a day

-Jason
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post #4 of 8 (permalink) Old 09-09-2011, 03:47 PM
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maybe throw some BBs and seafoam in there while you shake it?
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post #5 of 8 (permalink) Old 09-09-2011, 03:50 PM
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Quote:
Originally Posted by Pilotx1 View Post
NO WATER!!!!!! youll create a rust problem youll regret forever


fill the tank with a petroleum solvent and let it soak, swishing it around a few times a day
^What he said.

You could try this http://store.usavediscountmarine.com...Code=STA-93664. Haven't tried it myself though. I have never let gas get that bad.
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post #6 of 8 (permalink) Old 09-09-2011, 03:51 PM
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fill it with acid for one hour, drain, then coat with POR15.

Shitty Pass Racing #513
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post #7 of 8 (permalink) Old 09-09-2011, 04:11 PM
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Quote:
Originally Posted by eE jeremy View Post
fill it with acid for one hour, drain, then coat with POR15.
phosphoric acid is prefered as it will phosphate coat the steel and give it a little bit of rust resistance

-Jason
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post #8 of 8 (permalink) Old 09-09-2011, 05:26 PM Thread Starter
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Quote:
Originally Posted by BlackBettyR1 View Post
^What he said.

You could try this http://store.usavediscountmarine.com...Code=STA-93664. Haven't tried it myself though. I have never let gas get that bad.
Bike has been sitting under a tarp, under a deck/patio for over 10 years in Charlotte, NC. I think the old gas and muck actually kept the tank from rusting threw the metal of the tank.

Chicks dig guys with hippohands on their sportbikes.

Drew "Droopydawg" Mobley
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