Quote:
I have heard complaints before that pump fuel has changed.
IIRC people complaining that it no longer evaporated as it did and now left a "sticky" residue that gummed up the works.
Is this your experience too?
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Yes. It's the first thing I noticed when I started my waste solvent tests after a tear down of the engine for inspection. Today's pump fuel in the USA is garbage IMHO. Plus, it doesn't work very well for today's DI engines. Just a quick visual of the exhaust tail pipe on a DI new engine drives me crazy!!! My 22' Toyota Tacoma that I bought brand new drove me crazy when I first got it with all the black soot inside the tail pipe. I'm not a chemist but I'm smart enough to know that this black soot is definitely a byproduct of incomplete combustion. The Tacoma now has 66k on it and still doesn't consume any oil between oil changes. So, it's not oil consumption that is making the soot.
On the Talon the tail pipe is clean as can be on waste solvent, petrol race fuel and E98. On E85 its cleaner then then pump petrol but not as clean as E98 or waste solvent and race fuel.
Now the bigger question is why is todays fuel this way??? Is it a cost issue? Is it a product of design issue? Is it a EVAP issue? Is it a VOC issue?
I'm going to do a test on my home-built combustion tester in a few weeks to show the difference between todays pump fuel and waste solvent.
