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I think this car has a special relay (fuel pump emergency shut off) under the hood that shuts off the fuel pump after a crash. Call the dealer and ask for a new one, it is a one time use and must be replaced.
My daughter has an 02 Optima would not take fuel unless it was down to 1/4 tank due to back pressure (similar to being full). Ran several hours of
troubleshooting including removing and checking the cannister, which was fine. I
finally found a 1-way check valve that was installed backwards (at the factory).
As soon as I disconnected the valve, the pressure instantly released. We
reversed it and the car took fuel normally. The valve has the flow arrow molded
on it. It should point toward the fill cap, not to the tank. The valve is located behind a panel in the wheel well, near the filler. Small plastic with a blue and black end (at least on my model). Hope this works!
At that millage you will need to change the oil, transmission fluid and engine coolant. You should also possibly change the timing belt and water pump. Check you owners manual for any additional services.
The thing is your doing the timing belt the water pump is right their with it . it should cost you much more at all besides the cost of the water pump. When doing a timing belt I have a rule that I go by The timing belt/seals =cam , crank , any pulley & tensioner & water pump all get replaced at the same time. I did a t-belt on a Audi A-8 very complex whole front of car has to come off as well, he didnt want to do w-pump & thermostat his thermostat was their as well not even a month later the water pump gave out he had to pay double the price because he didnt want to do it when I had it apart the first time. And make sure mechanic is ase certified . good luck