[Roadsters] Not Datsun-specific, but relevant to the subject of reviving older vehicles

[Stephen Holst]

Hi:
Lots of people use gasoline stabilizers in their old cars.  The major active
ingredient in these products are light mineral oils (so called Pale oils
­kerosene some are diesel fuel) these oils tend to coat metals and inhibit
corrosion-indeed gasoline is really a very very light mineral oil.  Methyl
Alcohol will strip the oil coatings from metal products.  Without these
protective films and with the current composition of gasoline 10 percent
ethanol (ethanol contain at least 5 % water and is hydroscopic so will
attract more) rust is the inevitable consequence.  So beware.  Use Ave gas
or gas without ethanol in any case if the protective oil film has been
removed recoat with something like gas stabilizer, kerosene or Diesel.
Diesel is a good substitute for stabilizers and also offers a cleaning agent
(since it has an automotive detergent built in)  for the SU carbs and float
systems.
Steve
SRL 2000


On 1/30/18, 9:25 PM, "joey via Datsun-roadsters"
<datsun-roadsters at autox.team.net> wrote:

>  
> I did something similar but there was an unfortunate side effect.  Once I was
> done cleaning it out and switched to gas, it somehow accelerated the
> rusting/corrosioin inside the tank.  For ex:  My fuel sending unit was pretty
> clean.  After I was done and switched to gas, I went from gunk in the tank to
> rust.  I pulled the fuel sender a few weeks later and it was rusting terribly.
> it rusted more in a month than it had for several years in a dirty gas tank.
> I'm not sure why that happened but it did.
> So I pulled the tank back out and took it to get sealed.  That is what you
> should do so you don't have to worry about it anymore.
> 
>   
>  
>   
>  On Tuesday, January 30, 2018, 8:50:12 PM EST, Gary McCormick via
> Datsun-roadsters <datsun-roadsters at autox.team.net> wrote:
>  
> 
>  
> 
>  
> Has anyone used denatured alcohol to clean the varnish out of an old gas
> tank that hadn't been drained before being left to sit? I have been
> using it on a motorcycle gas tank and it seems to work pretty well.
> 
> First I sloshed some mineral spirits around in the tank, which seemed to
> clean it up a bit, then I switched to denatured alcohol. After soaking
> overnight with about half a quart of alcohol in the two-gallon gas tank,
> the alcohol looked like Guinness when I poured it out. I've gone through
> two more iterations, and it has come out cleaner and clearer each time.
> Once the alcohol comes out clear, I'll dry the tank out really well with
> compressed air and switch to gasoline. With any luck I'll be firing up
> the little beastie before the weekend.
> 
> Gary McCormick
> 1970 2000 Roadster SRL311-13291
> San Jose, CA
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