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Here is the location and procedure: http://www.ehow.com/how_4507472_replace-fuel-filter-hyundai-sonata.html As for the radio, look for any loose wires going to the radio especially the power lead.
Have the tire balance checked on that tire. May have thrown a balancing weight.
Sounds like the TCM has failed (Transmission Control Module). You should take to trans. shop for diagnosis. Other possibility is the torque converter clutch solenoid. Best to get the diagnosis before throwing money and parts at it.
The head gasket has failed and needs to be replaced. The oil and coolant are mixing through the failed gasket causing the white smoke and the reservoir to fill.
Most likely cause, the front brake lines have a leak. Fill the reservoir all the way, and have someone pump the brakes. Look and listen for the break in the line.
This sounds more like a faulty exhaust issue. Get code read for free at autozone and post on here. Suspect you will get o2 sensor faults. Problem will either be those o2 sensors or the cat. converter has fouled and is backpressuring the exhaust toward the engine.
Did you try to just put fuel in it? While changing the fuel pump you may have dislodged the fuel level sensor and you may actually be out of gas because you are getting a false level reading. Otherwise, check for power and the relays for a short caused usually be a loose ground wire.
If they just installed it, have them reinstall. Shouldn't be a charge to you. They forgot to hook something up or blew the fuse.
Take to a shop and have them check exhaust flow. Could be a fouled and failing cat. converter.
With the vehicle turned off, Touch the voltmeter to black on battery and the red to the connection at the alternator. If the read is 0 then you have a break between the alternator and battery. Follow the red wire from alternator to the fuse box. Is it possible the fusible link has burnt out at the fuse box.