It is INSIDE of the fuel tank.
FlexFuel will be written on the vehicle somewhere if that vehicle is Flex Fuel.
The 2009 Ford Flex runs on regular unleaded.
If the engines are identical, yes.
Roughly 13 gallons
You cannot burn E85 in a vehicle that is not Flex Fuel. I do not think your Trailblazer is Flex Fuel. If it is it will have a yellow gas cap, and a sticker saying Flex Fuel. If you have any doubts look in your owner's manual or call your GM dealer and provide your VIN#. They can verify if it is Flex Fuel.
Yes, it does and it is more than likely located in the fuel tank.
The 2009 Lincoln Navigator runs on flex-fuel (FFV).
The 2009 Chevrolet Impala runs on flex-fuel (FFV).
The 2009 Ford Expedition runs on flex-fuel (FFV).
No.
To replace the fuel filter on a 2009 Chevy Cobalt, first relieve the fuel system pressure by removing the fuel pump relay and starting the engine until it stalls. Next, disconnect the battery and then locate the fuel filter, which is typically near the fuel tank. Use a fuel line disconnect tool to detach the lines from the filter, and then remove the old filter and install the new one, ensuring the flow direction is correct. Finally, reconnect the fuel lines, battery, and fuel pump relay before starting the engine to check for leaks.