 | Home > Puma (Tdci) > Fuel rail pressure |
 
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| DAZ110 Member Since: 06 Dec 2007 Location: East Sussex Posts: 2027   
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Hello Blackwolf,
Using the Ultagauge I have just bought, these are the readings I have: Tickover: between approx. 3400 to 3800psi 1500rpm: between approx. 4500 to 5000psi 2500rpm: between approx. 7000 to 7600psi As I have just installed the Ultragauge I hope I am providing you with the correct info.  
Cheers Darren |
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28th Nov 2013 2:28pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17242 
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Hi Daz,
Very many thanks for that info. Those figures are much the same as mine (mine are a little higher but not enough to be significant) so it does suggest that there isn't a serious problem with my fuel pressure! At the moment, everything I can rule out is good. I am of course assuming that your Defender is running properly and does not display the same sort of fuel starvation issues that mine is doing!  |
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28th Nov 2013 4:41pm |
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| DAZ110 Member Since: 06 Dec 2007 Location: East Sussex Posts: 2027
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I've got no running problems at the moment, and hopefully it will stay that way! I forgot to mention that mine has been remapped by BAS, but I don't know if that makes any difference? The pressures on mine did drop below and rise above the figures I gave you from time to time. Also they where taken from a cold start, do they increase once warm? |
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28th Nov 2013 6:26pm |
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| Lorryman100 Member Since: 01 Oct 2010 Location: Here Posts: 2686 |
The fuel rail pressure can go to above 23,000psi before the limiting valve quits on you. Have a look at the below live data page I took when I was testing some OEM remap files for Alive tuning. At some points the rail pressure is 154 MPa which is 21,900 psi.
FORMULA: MPa x 145.0377 = Psi. |
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28th Nov 2013 6:36pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17242
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Daz, thanks. I too have a BAS remap (with EGR disable) and until my fuel microbe contamination issue two weeks ago the Defender was running sweetly. Since then, not so good!
The main reason I wanted to check the fuel rail pressure is because I am getting a P0089 fault from the ECM which according to the WSM means that the pressure limiting valve on the fuel rail is leaking, however I am not convinced that it is. According to the Transit documentation, this code can also be generated if there is or has been air in the fuel. Either way, the first step seemed to me to be to see if my rail pressures were about the same as one that runs properly, which apparently they are. Brian, would I be right in thinking that your live data was collected while driving (rather than stationary)? I imagine so since otherwise the correlation between throttle pedal position and engine revs is rather terrifying! |
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29th Nov 2013 10:28am |
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| DAZ110 Member Since: 06 Dec 2007 Location: East Sussex Posts: 2027
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Mine has the EGR disabled too.
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29th Nov 2013 4:56pm |
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| o4dn Member Since: 08 Jan 2010 Location: South West Posts: 538  
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Humm, I just took my MY2009 2.4 Puma for a drive and tried to monitor the FPr using the Scangauge, and it went as high as 176, and I don't think I was even pushing it hard.
176 * 145.0377 = 25526 PSI 
Should I be be worried?? Last edited by o4dn on 21st Mar 2015 3:33pm. Edited 1 time in total |
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21st Mar 2015 12:27pm |
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| Lorryman100 Member Since: 01 Oct 2010 Location: Here Posts: 2686 |
Are you using the x gauge code for the FPr setting on the scan gauge?
Is your Puma remapped? If it is standard OEM and the gauge is set up properly then the rail pressure is about 5000 psi to high. |
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21st Mar 2015 2:39pm |
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| o4dn Member Since: 08 Jan 2010 Location: South West Posts: 538
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Ah no, I didn't use any specific X-code for the FPr, just the "FPr" gauge that comes as standard.
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21st Mar 2015 3:34pm |
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| o4dn Member Since: 08 Jan 2010 Location: South West Posts: 538
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Hi Brian,
Well, I must be senile, now that I re-read your post, I most likely entered your x-code from http://www.defender2.net/forum/post83016.html BTW, the gentleman who posted the screenshots there http://www.defender2.net/forum/post83756.html#83756 is reading a much higher fuel rail pressure than I do ... |
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21st Mar 2015 3:43pm |
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| Lorryman100 Member Since: 01 Oct 2010 Location: Here Posts: 2686 |
The scan gauge is a handy tool for keeping an eye on certain sensor addresses but I would not rely on any of the readings as being 100% as I have had a FPr reading of 201 which if it was accurate would have popped the limiting valve and if that did not pop the pressure would have destroyed the fuel rail and most likely the pump as well. If I get a spurious reading that does not look quite right on the scan gauge I plug in a diagnostic tool and have a proper more accurate read on the potential issue as the scan gauge is a generic scan tool which gives you a heads up on a potential issue but is not a dedicated LR diagnostic tool.
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21st Mar 2015 5:36pm |
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| Lorryman100 Member Since: 01 Oct 2010 Location: Here Posts: 2686 |
Pm replied to
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21st Mar 2015 5:45pm |
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