STC wrote:according to auto data injector nozzle opening pressure is 250 bar
I didn't see that on Autodata, I'm under the impression that this is Common Rail ?
Me neither, it is Common Rail version 4.0. The last time I had this vehicle in from the FRP sensor using electronic test equipment, the rail pressure static was 3.50 Mpa, and when engine idling was 36.70 Mpa.
Wouldn't be a bad idea to test LP fuel flow & pressure before you go anywhere near the HP side.
Once that is confirmed, Are you able to monitor Actual & Desired FRP on your scan tool ? and as above monitor LP with a gauge.only a low pressure supply pump on the side of the fuel tank along with the filter.
On AD, there are 2 variations for that Reg No, the first one distinctly shows 2 fuel pumps - just 2 add to the confusion.
As above confirm pressure and flow on the LP side first, then move on.
I will look in Topix and report back if I find something.
STC I have been looking at the low system fuel pressure sensor fitted to this model, its the same as they fit on some of the BMW diesels, the part number of this fuel pressure sensor is Bosch 0261 260 046, I am kind of leaning towards this sensor being a MAP sensor that seems to be able to cope with pressures between 0.3 - 4.0 bar. You referred to the testing of this previously where I advised that the supply voltage was 5V, the ground terminal number 2 was 0V, and the terminal 3 was about 2.5V and dropped to about 1.7V when the engine was revved up. AD advise that the terminal 3 with the engine at idle should read 4.3V, they don't however advise if this reading should increase or reduce when engine revs are increased, but based on MAP sensor understanding the voltage level normally increases at WOT, and this sensor is reducing voltage at WOT, and fuel pressure would normally be expected to increase when the engine is revved up.