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Old 06-13-2005 | 08:17 PM
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sfd598
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Default flex fuel
I was reading the fine print on the sticker of my '05 and noticed it was a 5.3 flex fuel, what gives?
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Old 06-13-2005 | 08:34 PM
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and will it affect the performance of the motor
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Old 06-13-2005 | 09:05 PM
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Flex fuel means you can run E85 or 85% ethanol 15% gasoline, I think the only difference engine wise is bigger fuel injectors.
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Old 06-13-2005 | 09:23 PM
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The injectors are different, wiring harness connectors to injectors are different and the fuel pump is different.
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Old 06-13-2005 | 09:29 PM
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5.3 racer16
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i got the simple motor bigger injectors sound better.
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Old 09-19-2005 | 10:55 AM
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What injectors do they have?
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Old 09-19-2005 | 03:42 PM
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I think some of the seals are diffrent as well, E85 doesnt go well with stock seals or exposed aluminum parts....anyone know what years they put the flex fuel on?
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Old 09-19-2005 | 05:19 PM
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Started in '02. I believe all SUV's with the 5.3 have had the flex_fuel since 02. Only some of the trucks get the flex-fuel but it has been available in the 5.3 since '02.
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Old 09-19-2005 | 05:57 PM
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Originally Posted by BlueTahoe
Started in '02. I believe all SUV's with the 5.3 have had the flex_fuel since 02. Only some of the trucks get the flex-fuel but it has been available in the 5.3 since '02.

that sounds about right. i'd rather have the flex fuel vehicle for modifying. they have a large fuel system to start with.
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Old 09-19-2005 | 08:14 PM
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Originally Posted by D_Run
What injectors do they have?

38#'ers
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