[AT] GM Flex Fuel vehicles

[charlie hill]

Thanks Steve,

That pretty much answers what I wanted to know.  The next question is:  I 
wonder if GM could make a conversion kit for their vehicles (since they 
obviously know the differences between the two versions), do the testing and 
get it approved for conversion at a GM dealer or something like that.  Much 
the same way the aftermarket industry gets performance equipment approved 
maybe.

Charlie
----- Original Message ----- 
From: "Steve W." <falcon at telenet.net>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Monday, July 31, 2006 10:18 PM
Subject: Re: [AT] GM Flex Fuel vehicles


> 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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>>
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