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Tom C., Too bad we don't live closer. We have almost identical Suburbans with two exceptions. Mine is RWD and has always lived in the South. I, too, have Flex Fuel which has the screwy fuel filter. I was lucky, I have a friend who is a professional mechanic and has all of the specialized tools. I had already bought two different tools trying to get the fuel filter off to no avail and finally borrowed the right tool. It's a Lisle 35000 Fuel Disconnect tool for GM. Amazon wants $15.99. Well worth it.
Before you try E-85, check the 12% Ethanol Rule. You will get 12% less mileage with Ethanol than with gasoline. If E-85 isn't at least 12% cheaper than gasoline, it won't be to your financial advantage.
I've also replaced the fuel pump, so I feel your pain. It's a bear to get that large (31 gal) fuel tank out, even with help.
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