1997 Cadillac STS Repair Question
Why wont car start
The fuel pump relay may be failing intermitantly. Try replacing that and also have antoher shop test the fuel pressure.
Before you do any of that, have the trouble codes pulled. Any Auto Zone or Advance Auto will do this for free and it will let you know most electrical issues involved.
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If your gas gauge is suddenly incorrect after replacing the fuel pump, then chances are you either have a defective pump or damaged something installing it.
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