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Re: Are you suppose to use premium fuel with a 2004...
Really, you need to use what the manual reccomends, in your case that should be premium. While you will usually not suffer damage from using lower grade, you will suffer performance and economy loss.
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You have to drop the fuel tank to access the fuel pump and sending unit. Yes the fuel pump and gauge sending unit are separate but connect together in one assembly.
Remove the panel it's mounted in and remove it. Don't run the system without it though, it will unbalance the output and could blow the output transistors.
The pinging noise that you hear is detonation occuring in one or more of the cylinders. The dealer suggested to move to a higher octane inorder to prevent this because the higher the octane the higher the prevention of Detonation.
The Probable cause of the pinging, would be that you refilled with a bad batch of gasoline. Premium should be used in this vehicle no matter what. Due to the clearances of the heads and valves in the motor. And also due to the material used to make the cylinder heads, if severe detonation occures then the valves could be damaged.
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