First thing we did... changed fuel filter.

Are you seeing cranking RPM on a diagnostic tool that would demonstrate that the CKP sensor is working?

What volts are at the rail pressure connector?

GraemeS wrote:

Are you seeing cranking RPM on a diagnostic tool that would demonstrate that the CKP sensor is working?

Mikey wrote:

What volts are at the rail pressure connector?

I was thinking of confirmation of the 5V supply to the sensor rather than a dead sensor.

Ok. So this making my head hurt trying to work out what is happening here! And following pipes... Again... right back to the beginning but remembered something that I thought was really unusual, but put it out my mind. Why I don't know. I noticed fuel coming out of the return line from the HPFP. And today when going back over everything, took the return line off at the secondary pump, where fuel was coming out, under pressure, from the return line. So basically the fuel flow is being reversed! Return line from the tank is blowing fuel out. Only thing I can think now is the in tank pump has gone wrong...

I would remove the fuel filler cap to rule out a tank breather issue.

Clutching at straws but have you investigated the possibility that the crash sensor has triggered in some way ?

Airbags haven't gone off I take it, but the fuel cutoff may have initiated or tripped.

A. Fuji White / Jet 2012 4.4 TDV8 Westminster