I replaced the factory fuel pump in my 2002 Ford Taurus 134,000 several months ago with a pump and sending unit from Auto Zone. The gauge has stopped working right after the install and the car does not start properly acts like it is starving for fuel. Once running it idles and accelerates fine. Engine light states it is the pump, still under warranty. Question is should I get a factory pump this time? Any suggestions? I am frustrated these are a pain to put in. My buddy who is a mechanic says it could be pressure regulator.