Where is the secondary circuit located on the fuel pump on a 2000 Ford Taurus SES 3.0 V6

Question

I had my car put on a computer and it gave me a code number P1237 and P174 and P171 and I replaced the PCV valve I wanted to know about where is the fuel pump secondary circuit is located and can it be fixed or do I need a whole new fuel pump

Answer 1

P1237 Fuel pump secondary circuit

This code would be the fuel pump itself that set the code. The secondary circuit is at the fuel pump