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Could be many things, but fuel pressure regulator, leaking injectors are most likely. DO NOT DRIVE UNTIL FIXED. If the fuel is really getting into the oil pan, oil will be diluted and could damage engine bearings.
lift out the rear seat and remove the fuel pump and gauge unit. Cover the tank with a piece of plastic and tape and tape to stop fumes escaping. See if the float is still there. Check the follower on the level resistor. If the resister strip is black, try to gently clean it with a pencil eraser. Swing the arm up and down and see if your gauge moves
Filter is mounted directly above the pump module on top of the fuel tank. You may have to drop it down a little bit to change it. Also check the fuel pressure with a good gauge while it's running poorly and see if it's out of spec.
Check all fuses with a test light. If all good, you will need to diagnose each circuit. Look for the temperature sensor, disconnect connector, ground test light and touch wire. Check to see if the gauge move. If it does, you will need a new sensor. Basically the test is the same for fuel gauge. Disconnect connector at the fuel tank and touch contact and see if gauge move. If it does, the sending more than likely is at fault. Make sure you test each wire as there will be a few. Use proper jack stands anytime you work under a car! Let me know your progress.
see if there is any acces to the fuel tank cover under the rear seat, if it is then remove the screws and remove the sending unit sending unit inside the tank most likelly it will be bad, but if you don't feel like doing it, then take it to your mechanic but seems to be the sending unit inside the tank wich is the sensor trigering your gage is not good and need to be tested and replaced