about the fuel pump on 2000 Lincoln LS

My car was wrecked on the left side in the back it drove fine one day then the next it wouldnt start. I waited a month to save up money to get looked at which water got in the trunk, the mechanic that looked at it said the rain messed up my computer system or either the fuel pump. no one can seem to fix it. have anyone else experienced problems with their fuel pump??

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2 answers
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driver side front kick panel theres a fuel pump shut off switch that turns off the gas in a wreck just remmove panel and push red button