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Fuel and fuel systems Petrol vs Diesel, LPG Conversions, premium fuels, and all that gas

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  #1  
Old 15-11-13
Rapid_Axe Rapid_Axe is offline
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Default Common rail fuel pressure

Hi all

What should the fuel rail pressure be in a common rail diesel?

I've been hunting a surging issue for the last three weeks in my NS Paj and last night decided to get the OBD2 scanner out and watch what the car was doing when it surges in Torque.

- Revs ok and doesn't drop
- Boosts ok
- Temps all ok
- Keeps speed ok
- Auto doesn't flair and shifts ok

The only thing I saw was when I put up the fuel rail pressure, on soft acceleration the pressure would sit at about 4500 psi and not move much, when I accelerated normally it fluctuated between 7500 and 23000 psi (during the surging)

Safe to assume the pump is gone?
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Last edited by Rapid_Axe; 15-11-13 at 08:47 AM.
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Old 15-11-13
Rapid_Axe Rapid_Axe is offline
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Also where would I be looking at the engine to see where the pressure sensor is? Can't hurt to look at that either.
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  #3  
Old 15-11-13
FIS9076 FIS9076 is offline
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Im no expert at all, but I think that the common rail fuel pressure is linked to the actual engine speed, as it, the higher the revs, the higher the fuel pressure.

Ive got mine idling around your 4500, and steadily increases with engine rpm up to max (not sure exactly but your 23000 sounds right)

I did have an issue with mine where an extra filter was creating too high resistance to the fuel pump so it would hesitate when accelerating, but I wouldn't have said it was a surge.

Perhaps try throwing on a new fuel filter and seeing if anything changes?

Fuel rail pressure sensor is at the back of the big manifold bit that all the injector lines run off, below the air intake manifold and above/behind the fuel pump

Dan
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Old 15-11-13
Rapid_Axe Rapid_Axe is offline
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You could possibly be right because it seems with revs that it increases but it shouldn't go to 7500psi, then to 23000psi, back to 10000psi, back up, down, up like that as revs increase.

It's going in for a service next Tuesday (150,000km) so should answer my question there, could also be the filter is blocked.
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Old 29-04-15
ijoe ijoe is offline
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Wow, I know this tread has not had any reply for over 2 years,

But..

I'm experiencing the exact same issue..
Just wanted to know the outcome and if there was any way this could of been resolved without taking to a dealer..

cheers
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Old 29-04-15
RUGGA RUGGA is offline
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Rapid Axe has not been active on this forum for over a year now.


Rapid_Axe Rapid_Axe is offline
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Old 30-04-15
ijoe ijoe is offline
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Yeah i saw that..
Never know when someone might get a email saying someone replied to their thread.

I'm hoping someone knew the outcome.. As my Paj is experiencing the exact same issues, I too can see the Rail pressure dip up and down using Torque and a IDBII tool..
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Old 04-04-17
wakeboarder wakeboarder is offline
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another 2 yrs on I just had the same problem to the point where car was stalling flat out.
replaced scv, fixed problem temporarily. new fuel filter, cleaned tank , fuel lines and and in tank filter plus added filter to tank vent and its running the best it ever has since I have owned it.
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Old 04-04-17
RUGGA RUGGA is offline
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Quote:
Originally Posted by wakeboarder View Post
another 2 yrs on I just had the same problem to the point where car was stalling flat out.
replaced scv, fixed problem temporarily. new fuel filter, cleaned tank , fuel lines and and in tank filter plus added filter to tank vent and its running the best it ever has since I have owned it.
Well done, did you have a dealer do the work?
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Old 07-04-17
Seigried Seigried is offline
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I had this on my NS. Replaced fuel lines filters maf and map clean fixed mine. Still need to do the in tank filter for piece of mind.

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