1996 Dodge Ram 1500 2WD, AT, 3.9. Starts but quits once warm. After two days of not running (windows up), the cab smells strong of gasoline.

Checked codes with ignition switch. It blinks 1-2-5-5. Can't find the code.

My guess is a fuel pump, but I hear it running. Any ideas before I take that apart? Any are welcome.

Much appreciated. It's a great truck otherwise.