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| Motorized Bicycle General Discussion Topics on bicycle engine kits, help articles, repair and modifications for your motorized bicycles |
how much rust is too much for inside your gas tank?
Discussion at Motorized Bicycle Engine Kit Forum in the Motorized Bicycle General Discussion forum. because there is plenty in mine. what should i do? ive read to use a shop vac but this just ...  | 
08-11-2009, 03:07 PM
| | Motorized Bicycle Newbie | | Join Date: Jul 2009 Location: chicago
Posts: 15
| |  how much rust is too much for inside your gas tank?
because there is plenty in mine. what should i do? ive read to use a shop vac but this just seems like it would be useless. is there supposed to be a tolerable amount in there or should i try and get a replacement? any help would be much appreciated. this is my first built btw, im outside trying to slap it together as we speak! |
08-11-2009, 04:01 PM
|  | Master Bike Builder & Forum Sponsor | | Join Date: Dec 2007 Location: Duvall, WA PNW
Posts: 2,685
| | Re: how much rust is too much for inside your gas tank?
If it was really nasty I would ask for a replacement. Some crust and rust is normal, and treatable. Get out as much as you can, then put a bunch of clean screws, nuts, BB's, chain, etc in the tank and shake the heck out of it. This gets most of the crusty stuff. Then spray with PB Blaster or Kroil a few times, double rinse with premix gasoline and you should be good to go. |
08-11-2009, 04:04 PM
|  | Motorized Bicycle Elite Member | | Join Date: Apr 2008 Location: Valparaiso, IN
Posts: 554
| | Re: how much rust is too much for inside your gas tank?
If it can't be made completely, 100% clean with a couple hours of diluted toilet bowl cleaner, then get a new one.
How much cancer is too much? |
08-11-2009, 04:59 PM
| | Motorized Bicycle Newbie | | Join Date: Jul 2009 Location: chicago
Posts: 15
| | Re: how much rust is too much for inside your gas tank?
i sprayed it with wd40 and used a brush to get a bit of it off. what is pb blaster and kroil exactly? any different or better than wd40? and what do you mean by premix lol im a newbie.
by diluted toilet bowl cleaner i assume you mean with water. what kind of toilet bowl cleaner would you think to use? ive been using clorox for my toilets, which im sure contains bleach, and im not sure about using that. |
08-11-2009, 05:51 PM
| | Master Bike Builder & Forum Sponsor | | Join Date: Dec 2007 Location: Duvall, WA PNW
Posts: 2,685
| | Re: how much rust is too much for inside your gas tank?
Quote:
Originally Posted by stpwellington  i sprayed it with wd40 and used a brush to get a bit of it off. what is pb blaster and kroil exactly? any different or better than wd40? and what do you mean by premix lol im a newbie.
by diluted toilet bowl cleaner i assume you mean with water. what kind of toilet bowl cleaner would you think to use? ive been using clorox for my toilets, which im sure contains bleach, and im not sure about using that. | PB Blaster and Kroil are also spray penetrants/rust removers, in a class above WD-40. But don't knock yourself out finding them. Problem with a brush is you can't reach all the areas. Premix is fuel oil mix.
Can't comment on the toilet water. Never tried. |
08-11-2009, 06:48 PM
| | Motorized Bicycle Elite Member | | Join Date: Apr 2008 Location: Valparaiso, IN
Posts: 554
| | Re: how much rust is too much for inside your gas tank?
I have used hydrochloric acid based toilet bowl cleaner for this exact issue- but it is a lot stronger than you think- 1/4 strength or less would probably work. It will etch the tank. After the hydrochloric acid, a wash with a phosphoric acid metal prep will prevent flash rust and help prevent re-rusting overall.
Different approaches- I'm sure Pablo's will work, I just know that I have done it this way. |
08-11-2009, 10:53 PM
|  | Moderator | | Join Date: Sep 2008 Location: Littleton, Colorado
Posts: 1,908
| | Re: how much rust is too much for inside your gas tank?
Course sand or small pea gravel will also work. A couple of cups, shake the tank hard until your arms get tired then pour out the sand/gravel and rinse well wth hot water. Compressed air will help dry the tank after the water but make sure you get all the sand out. If you have access to a sand blaster (bead blast) that also works good but again rinse until you know the sand is all gone.
Tom
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08-12-2009, 02:25 PM
| | Motorized Bicycle Newbie | | Join Date: Jul 2009 Location: chicago
Posts: 15
| | Re: how much rust is too much for inside your gas tank?
thanks everyone. im gonna give it a shot and ill let you know how it turns out | | Thread Tools | | | | Display Modes |  Linear Mode | 
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