The fuel pump isn't going to cause the car to run rich as long as the fuel pressure regulator is doing its job. They only way that you would run rich is if you bumped up the fuel pressure in the fuel rails. Then the injectors wouldn't meter properly.

I can't help you with the overheating problem. I would check and make sure to burp the coolant in the car really well before assuming that something else is causing it. I had an air pocket in my car and it over heated off and on till I burped the system.


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