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Old 01-27-2007, 03:23 PM   #1
wintonio OP
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how to clean BMW gas tank?

OK, to say I don't know my ass from a hole in the ground might be an understatement.
I have a '92 R100GS. What do I use to clean out the tank? It is the metal kind, with the paint on the inside. The dealer told me to use fresh gas, let it dry, use more fresh gas, I presume swirling it around, then let it dry again. At this point, I am almost afraid to try anything my local dealer says. SO. what should I use, and what is the technique?

Note: I am not currently having any problems that I am aware of, just doing some maintenance.
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Old 01-27-2007, 03:28 PM   #2
JohnTM
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What condition is the inside paint in, and what is in the tank, rust? Or is is just stale gas?

If the lining is good and there is just gas crud, then your dealer has it right. If the lining is bad and there is rust, then it's a whole different story.
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Old 01-27-2007, 03:29 PM   #3
budsboy
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The way to clean the tank is -
Fill with fresh gas
Ride bike untill all the gas is gone
- Repeat

No need to do anything else -
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Old 01-27-2007, 03:40 PM   #4
wintonio OP
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ok, I can do that. Like I said, there is no rust that I am aware of. I have just read that it is good to clean the tank out once a year, to make sure there is no water in there etc., so I was looking for the procedure for that.
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Old 01-27-2007, 03:50 PM   #5
RocketJ
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Water

Water is the universal solvent. I use hot tap water with dish soap. Slosh it real well. Repeat. Rinse with hot tap water till it all comes out clear. let it dry in the sun for the afternoon. Next day, slosh some clean gas all around to get rid of any left over water.
You will be suprised how much crap comes out this way that plain gas leaves behind. YMMV
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Old 01-28-2007, 04:29 PM   #6
RandyB
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I just took my GS tank to the car wash after pulling the petcocks. .75 later and it was clean. One full tank of soap and the rest rinse. The liner was peeling and clogging the screens.
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Old 01-28-2007, 04:35 PM   #7
jdiaz
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Quote:
Originally Posted by RocketJ
Water is the universal solvent. I use hot tap water with dish soap. Slosh it real well. Repeat. Rinse with hot tap water till it all comes out clear. let it dry in the sun for the afternoon. Next day, slosh some clean gas all around to get rid of any left over water.
Yep, this is what I do as well. The 1/2-inch of gas left below the reserve tap holds a ton of junk in the tank that riding around will not get rid of.
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