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I am using a 2001 Mustang Cobra donor on my Mk IV. I have power to the fuel pump relay and to the fuel pump but no function from the fuel pump. Everything worked perfectly when I disassembled the donor in January so replacing the fuel pump is not my first instinct. I am not using the evap system. Does that effect the performance of the fuel pump?
 

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If you have power to the relay and power to the pump, and the pump isn't working, you have a grounding problem or bad pump. Test the pump by itself on a battery to be sure. To answer your question, NO.
 
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