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

[joey]

 I used LUCAS, Chevron, and a high end expensive rust inhibitor meant to go in the gas tank after cleaning it.    None of them helped a bit in my case.So I had it cleaned and sealed at a local shop.   the seal is dark red in color.   Worth the $175.  No issues anymore.   
    On Wednesday, January 31, 2018, 12:11:18 PM EST, Stephen Holst <stephen.holst at randrglobal.com> wrote:  
 
 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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