Taken from a Web Page:
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"What are the differences in an FFV compared to a regular gasoline-only model? Are different parts used?"

"The primary difference is the fuel sensor that detects the ethanol/gasoline ratio. A number of other parts on the FFV'* fuel delivery system are modified to be ethanol-compatible. The fuel tank, fuel lines, fuel injectors, computer system and anti-siphon device have been modified slightly. Alcohol fuels can be more corrosive than gasoline. Therefore; fuel system parts have been upgraded to be ethanol-compatible."
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I think this do-able, however, there are no conversion kits as of yet that I know of. Remember when R12 was being fazed out and everyone wanted to convert over to R134A? Can you see where I'm going with this?

A lot of people say that Ethanol has less engergy volume; this is true, but it has a way higher octane than gasoline. So this allows for an increase of compression to 12:1 and you can bump the ignition timing way up. After doing all that, you end up with an engine way more powerfull than one ran on gasoline.

What is an anti-siphon device?

maybe eventually they would conversion kit but in west side of mi their is only one or two station that have ethonel has to be more popular. And if is more corrosive wouldn't the engine has to be mod I know I dodge motors that can run them are different the actual motor I think they use maye different tyoe metal or coat it

Stoichiometric for gassoline is an A:F of ~14.7:1 for ethanol or methanol it is closer to 10.5:1. 40% richer! That means proportionaly larger injectors and lower fuel economy.

Add PCM programing and any sensors to allow fuel blends and it gets expensive fast.

can't up the compression much and stay flex fueled.... maybe thats why they dont go to 100% ethanol.

Also, any conversion kits would need to pass government certification first which is very expensive by itself.

An anti-siphon valve is nothing more than a one-directional valve. It can be as simple as a spring-loaded flap that lets a fluid (Gasoline/Corn oil in this case) flow in only one direction

Sort of like a PCV.