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Peugeot 4007, 2013.
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Do you mean fuel pressure sensor, if so

(with ignition on)
Pin (3) 4.8 and 5.2v
Pin (2) 0 and 0.2v
(without) Pin (1) which runs ECU AG3 is less 1 Ohm (0.5 Ohms Nominal)
 

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Discussion Starter · #3 ·
first off thank you for your reply.

I mean the the regulator / cut off valve on the diesel high pressure pump. It has 12v from from pin 8 of the black plug in engine bay fuse box and 3.5v from ECU brown plug pin M4. I think this is supposed to be a negative but I can't understand why it has 2 different voltage
 

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There is no specific voltage you will see on most normal test meters.

It has a switched PWM voltage supply and the pressure is regulated by the pulse width/duty cycle of the regulator you need a scope to get accurate data.

Its rare for them to become intermittent other than o-rings wearing and jamming the valve they work or they dont

Its more likely to be air leak in the fuel system or not primed properly

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Discussion Starter · #5 ·
so I brought the lexia software and have looked at the data in fuelling. I will list what I read and hope someone can give me some input.

Ref fuel pressure 322 bar
Messured fuel pressure 1349 bar ( should be 270 - 320 bar )
Fuel flow regulator OCR 16%
Diesel output deliverd by pump ref value -70.50 mm.3/sec
Fuel flow to be reached in H/P rail 1360 / 2270 / 2590
Fuel temp 15 deg
Coolent temp 14 deg

No fault codes in controller and it is authorised to start
No injector issues,

The wiring from the fuel control valve and the the fuel pressure switch are good.
The 5v feed id load tested and good, the negative is tested and good. The signal wire to the pressure switch is 12v.

Any advice welcome. thank you Paul
if it helps chassis no is VF3GC9HWC96274676
 

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Your results are showing that the fuel rail pressure is far too high.
Have you checked to see if the return line is blocked?

I had a look at the high pressure pump for your van in servicebox parts list but it doesn't list the regulator as a separate item.
 

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Discussion Starter · #7 ·
Thank you for your reply, There is no fuel in the fuel rail so I suspect the new (ebay) pressure switch in the fuel rail faulty. I will go and get a good quality one today and check the data again. I have fitted another H/P pump complete with regulator from a working engine.
Fuel return good
 

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It must be a sensor or wiring short the HP pump is very unlikely to generate that pressure most can only generate around 300-500 Bar when cranking

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