2000 K3500, 4x4x, 7.4L, auto, dually.
I got a over rich code.
Forget what it was.
Checked the plugs, and they all look over rich.
Fuel pressure KOEO is 45 to 50psi.
But I ran it today, and got only 20psi running.
The pump has been changed last year, the regulator was changed the year before.
With the pressure so low, I'm thinking a bad pump.
Could a bad regulator cause the pressure to go that low???
I'll check it again later.