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Ouch, I put gas in my Diesel tank, how much is too much

I may be wrong but, I was under the impression that the problem is combustion/or lack there of.....along with any other problems of lubricity.
 
Kerosene is a middle distillate while gasoline is a light distillate:

http://www.turbodieselregister.com/mixing_gasoline_and_diesel.htm

Gasoline and alcohols hit diesel fuel right where it hurts the most. Those light thin fuels will lower the cetane number and lubricity. To explain how octane and cetane DO NOT work together...

The light distillates that gasolines are made from have a natural high-octane index. The middle distillates that diesel fuels come from have a high cetane index. The octane and cetane indexes are INVERSE scales. A fuel that has a high octane number has a low cetane number, and a high cetane fuel has a low octane number. Anything with a high octane rating will retard diesel fuel’s ability to ignite. That’s why each fuel has developed along with different types of engine designs and fuel delivery systems. Gasoline mixed in diesel fuel will inhibit combustion in a diesel engine and diesel fuel mixed in gasoline will ignite too soon in a gasoline engine.
 
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