Okay, I have a somewhat complicated issue. 2003 s10 with x code 4.3. I need to run a new power supply wire to my fuel pump. However, I can not find it. Where the grey supply power wire should be, is on the bottom of my fuse block in the c2 connector at pin a7. However this pin is blank. The b7 pin dose have the green wire with white tracker for the relay power supply side. Can anyone direct me as to where my fuel pump power wire originates from?