L86/L83.Flex fuel conversion with pics and part #s

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Slow5.0

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Did anyone did Flex fuel conversion on 6.2 or 5.3 SUVs, anyone have pics ?
Also did GM ever offered 5.3 SUVs with flex fuel. I know they did on early trucks but what about SUVs ?
 

STORMIN08

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my 17 is factory flex fuel, although i have never used E85...i would not mind trying if i know i will run through that tank quickly, i am not a fan of the moisture that the e85 draws
 

swathdiver

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Yep, as Stormin08 mentioned, the 5.3s are Flex Fuel and the software is in the computer (your 6.2) should you desire to add an alcohol content system to your truck. The GM-Trucks forum shows how some fellas did it with pickups and lots of photos and I reckon it would not be difficult to convert yours. There are also aftermarket solutions.
 
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Slow5.0

Slow5.0

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Thanks guys
Well did a lot reading on gm-trucks, problem is their fuel lines are different than SUVs
My 16 does have flex connector plug hanging there. I fo have HP tuners so no problem there. I just need find SUV vin # that have flex from the factory so i can use it to find short hoses to connecto to flex sensor. I could go with aftermarket Russell fittings and cut hard fuel line but i need that spot for my aftermarket fuel pressure sensor
So it would be nice to have last 8 of vin # that have flex from the factory
Im not sure if STORMIN08 suburban have same size of fuel lines since its longer than tahoe or my yukon
Thanks
 
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Slow5.0

Slow5.0

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Well mine says E85 MAX too

To my understanding they all compatible of flex fuel, they just missing flex sensor, bracker and one or two quick connect plastic hoses. I just have to found them. Pick up have different layout and on our SUV there is ABS pump right there so iys little different than on pick ups
 
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STORMIN08

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agreed in sorts...they all CAN be flex fuel, but did not come that way. so in the sense of ARE THEY ALL .. NO, that could be misleading towards the unknowing.
 
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Slow5.0

Slow5.0

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Ok. So i went to local GMC/Chevy dealer, found a few 15-18 Tahoes with 5.3. Asked sales man for build sheet. He said non of them are Flex fuel. I was ok, can i test drove one of 15s. He said ok give me keys. Took for a spin til i found curb. Im big guy and cant slide under this Tahoe. So curb helped just enough to squeeze. Yep found flex sensor and all hoses and bracket. Went back to dealer got vin # and than to parts guy
So it easy conversion, more swap, just 4 parts

13507129 Flex sensor $49.93
20967836 Hose $13.22
20967866 Flex sensor bracket $2.50
22772986 E85 Filler hose kit. $146.48 for this one im not sure if we need that bad

Only problem parts are on back order. Everything is plug and play. New female to female hose replace original female to male and goes on outlet of sensor on bottom. Original hose connects to top of sensor in inlet. Our setup is different than on pick ups. Our sensor sits horizontally so inlet and outlet point up and down. On pick up they point left and right. Its tight it that area because ABS is right there. 3 small holes are pre drilled for the bracket so no drilling.

So there you have it
 
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Fless

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Ok. So i went to local GMC/Chevy dealer, found a few 15-18 Tahoes with 5.3. Asked sales man for build sheet. He said non of them are Flex fuel. I was ok, can i test drove one of 15s. He said ok give me keys. Took for a spin til i found curb. Im big guy and cant slide under this Tahoe. So curb helped just enough to squeeze. Yep found flex sensor and all hoses and bracket. Went back to dealer got vin # and than to parts guy
So it easy conversion, more swap, just 4 parts

13507129 Flex sensor $49.93
20967836 Hose $13.22
15168649 Clip / bracket $2.94
22772986 E85 Filler hose kit. $146.48 for this one im not sure if we need that bad

Only problem they on back order. Everithing is plug and play. New female to female hose replace original female to male and goes on outlet of sensor on bottom. Original hose connects to top of sensor in inlet. Our setup is different than on pick ups. Our sensor sits horizontally so small pipes point up and down. On pick up they point left and right and on truck bracket is mounted on driver side frame rail. On SUV is mounted on crossmember. Its tight because ABS is right there. 3 small holes are already on crossmember for the bracket so no drilling.

So there you have it

Easy enough just to look inside the fuel door for the E85 sticker.

1625522766900.png
 

TollKeeper

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Not all them got that. My brothers 06 avalanche, if it wasn't for the yellow gas cap, there were no other telltales. Which when we bought it, it didn't come with. We had to get the VIN decoded for that, than added it
 

Fless

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Not all them got that. My brothers 06 avalanche, if it wasn't for the yellow gas cap, there were no other telltales. Which when we bought it, it didn't come with. We had to get the VIN decoded for that, than added it

My '04 FF didn't come with a yellow cap. And they can be put on non-FF fuel fillers, so that's not necessarily absolute confirmation.

EDIT: If nothing else, the RPO code description will list the FF capability. Mine is
1625524357500.png
 
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Slow5.0

Slow5.0

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Im foreigner, born and raised in Bosnia Europe, so i have right to joke around.
My brother in law have 17 Z06, and i always mess with him, dude, your Z06 is put together by bosnians in Bowling Green KY it will fell apart, so same thing, how nicely mexicans put these SUV in TX together, they always miss something
 
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Slow5.0

Slow5.0

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Here is parts diagram
Top is 2016 non E85
Bottom 2015 E85

Resized_20210711_110933.jpeg
Resized_20210711_110845.jpeg
 
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CMoore711

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I’ve been looking into this and it looks easy enough to do.

There are a couple aftermarket vendors that offer plug and play flex fuel sensor kits. They’re a bit more costly than piecing together and building your own, but certainly much more plug and play:



Also, I don’t think you actually need the 22772986 E85 Filler hose kit $146.48. Unless you want some sort of visual indicator/gas cap that says E85 Flex Fuel in it. And if that’s the case why couldn’t you just get the gas cap by itself? Or is it one of those have to buy the filler hose kit to get the E85 gas cap?
 
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Slow5.0

Slow5.0

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With Cjtunes kit you need to cut your line. DSX Tiunes is for trucks, they have different fuel line routting, with GM kit from E85 Tahoe/Yukon its 100% plug and play and cheapper if you can find hose and bracket anywhere thats in stock. I called GM dealers nation wide to get those parts. And i got a few extra just in case
There is now yellow cap for SUVs because its capsless. There is white E85 sticker on indide if fuel door. Im not zure why GM listed different filler kit on 15 E85 Tahoe than on my 16 Yukon Denali. Heck for 16 they offered
23232569
Tahoe & Yukon, without ppv, with e85
22827849
Tahoe & Yukon, without ppv, with e10

That 15 E85 Tahoe i found uses
22772986
Tahoe & Yukon, with ppv
Dont know whats different. You can buy invidual small hose from thise kits but they all same part #s, i think filler neck maybe different or with E85 kit you get small E85 sticker lol
 
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randeez

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log the fuel pressure **nevermind i see it, but show it on the graph and make sure it doesnt drop at higher rpm and figure out what you need to do to get the IDC to log. with DI you want to keep the idc max around 40% iirc
 
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Slow5.0

Slow5.0

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I didnt mess with scanner much, or any big tuning, im just glad this flex mod is now done
 

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