Well im glad I learned that today. I had figured that buildup was ethanol, but then again, i’ve never seen any real damage from e10, but i’ve seen damage from running e85 in something that’s not flex fuel, like one guy who ran e85 in his old 240. He managed to clog all 4 injectors and his rubber lines, just cause he thought the cheaper gas was better.

Well, regardless of what the buildup is, i’m going to clean it all up, and take it back off in about 5k miles to see what’s left, and go from there

 

Look similar to yours?

 

Yea, looks just about like mine. Even have those white exhaust valves from running too lean

 

Second pic is after running a supercharger with meth inj for a while. 11.5 afr by 6psi peak boost almost 12psi.

 

I must have something else (China) going on then as I am confident that it isn't neglect to expect rubber fuel parts to last more than 6 months which is how often I am replacing lines, gaskets and caps because they have developed vacuum leaks again.

 

There is no fuel in the intake manifold. Only air. The fuel is introduced by the injectors where the intake manifold meets the head.
What most folks are seeing is crankcase fumes that stuck to a hot intake manifold. No big deal.

 

From a strictly MPG aspect the ethanol free fuel didn't add any benefit that could outweigh the increased cost...We tried it on various sized vehicles in the work fleet to run the testing.. To make a long story short the best outcome money wise was to use a better grade of ethanol fuel which bumped the MPG up per each tank full....