[AT] GM Flex Fuel vehicles

[Steve W.]

Charlie,
  There are three major differences in them. One is the gas cap itself. 
Besides being Yellow it has a different vent valve in it because alcohol 
is hygroscopic so the venting is set up to only vent pressure. The 
second is the fuel line assembly. There is a 700.00 flex fuel sensor in 
the line that tells the computer what the mix in the tank is. The sensor 
is the same for all the flex fuel vehicles made from 2002 and up. The 
line itself is also made of a different material. The last change is in 
the injectors. Since alcohol has less energy than gasoline they 
increased the flow rate for the flex vehicles to accommodate the higher 
rate of fuel flow.

Now for the REAL problem. It is Illegal to convert any unleaded fueled 
vehicle to a different fuel unless you have the DOT do a test on the 
entire vehicle and can prove that it meets or exceeds the emissions 
standards for that vehicle type. That test is about 10,000.00 to have 
done. There are NO approved kits or methods out there to convert a 
vehicle to E-85 or other fuel. Get caught driving a converted vehicle 
and you get to pay a BIG fine for tampering with the emissions system of 
the vehicle.

http://www.e85fuel.com/e85101/faqs/conversion.php




charlie hill wrote:
> I have a question for the resident GM experts.
> 
> I have a 2006 GMC sierra pickup.  That same truck and same engine are 
> available in a Flex Fuel (E85) version.   I have no plan on trying to 
> switch mine but I'm curious about the mechanical differences in the two 
> engines. Obviously the computers are set up different but does anyone 
> know what else is different about them?
> 
> Seems to me that since GM makes them both ways it should be possible to 
> change the gas setup to flex fuel with off the shelf parts.
> It would probably cost too much and right now it wouldn't make much 
> sense to do it anyway.  I'm just curious about the process.
> 
> Charlie
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