Car was driving fine Friday going to work. Parked it there all day, then tried to start it. It cranks and cranks strong, but doesn't fire. Went back yesterday checked the codes - no codes - and she fired right up . So I took it for an extended test drive, and did notice a couple times there was a hesitation in power delivery, but other than that no issue. This morning again cranks but no start and again no codes

I'm leaning toward fuel pump, since I heard a pulsing noise and not a hum. Does anyone know what pins supply power to the fuel pump (positive/negative)? I would like to jump it directly to test it.