The fuel pump runs briefly at each start as the ignition key is turned thru "Run" to "Start" to prime the fuel system. Other than this short 2 or 3 second burst the pump is only active while the CPS detects engine rotation.does the cps control the fuel pump? My pump wasn't running yesterday but when I tried it today it kicked on and built up pressure. I started the car and it ran rough for a few minutes then died and now the pump isn't running. Also, does anyone know which of the 4 wires that go to the pump provide the voltage for the pump motor?