im finishing up a swap right now and having is fuel pump issues. the engine is a 2010 6.0l with a 4l60e, e38/t42 combo. the problem im having is the fuel pump wont turn on, it wont prime, and in the scanner under the bi-directional controls under the fuel tab the uel pump on and of tabs are greyed out, same with fuel pump-hi tabs. secondary fuel pump can be selected and i can adjust fuel pump pwm, however nothing happens. im running a ixed pump of a relay, triggered by pin 50. any ideas? ive done the vats patches and disabled starter checkes. an ive attached the tune file.
kevins 53 chevy 6.0l mod.hpt