Fuel Rail Pressure Sensor

Dollywasasheep · Monday at 21:58

Hope you guys can help, had issue with my Freelander 1 cutting out managed to borrow a diagnostic box from work, which said it was the rail pressure sensor, so took the sensor out to clean and make sure all ok, but when I took it out there’s like a second boss going into the rail which came out with it, behind this was a small insert type fitting. My question is which way round should this go back in as it had rolled onto its side when the boss came out. I guess the boss should stay in and have held this part, I just want to make sure it’s the right way round. I have put it back together the way I thought with insert slipping inside the boss, but upon test driving it all was good for 10 minutes and then it started cutting out again eventually dieing completely and needing a tow home.

Any help appreciated.

hd3 · 2025-02-04T12:47:50+0000

Dollywasasheep said:
but when I took it out there’s like a second boss going into the rail which came out with it, behind this was a small insert type fitting. My question is which way round should this go back in as it had rolled onto its side when the boss came out.

there's a pic attached here , that might help ..

TD4 fuel rail pressure sensor queries

so I recently swapped my old sensor for a new one, along with the harness. No issues until yesterday smelled diesel quite strongly, and then today when checking under the hood and Mrs.wlshyd gunning the throttle, saw diesel spurting from the thread of the new sensor.. Disassembled the engine...

www.landyzone.co.uk

.

Dollywasasheep · 2025-02-04T13:12:36+0000

Thanks hd3 well at least I got that bit right.

It's now coughing and dieing now and again, I have yet to plug it back in, but wondered what you may think is casuing the issue, the sensor was my next go to.

Arctic2 · 2025-02-04T13:28:39+0000

Dollywasasheep said:
Thanks hd3 well at least I got that bit right.

It's now coughing and dieing now and again, I have yet to plug it back in, but wondered what you may think is casuing the issue, the sensor was my next go to.

High pressure regulator O-rings most likely £5.22 for the part and about 45minutes work to remove and fit.

Citroen Xantia 2.0 HDi Common Rail Pump Pressure Regulator seal kit Bosch x 1 | eBay

Citroen: Belringo - C5 - Jumpy - Synergie - Xantia -. Xsara - Xsara Picasso (2.0 HDi 1999 - 2007). Evasion (2.0 Hdi 2000 - 2002). C8 2.0 & 2.2 Hdi (2002 - 2006). Jumper - Relay (2.8 HDi 2002 - 2009). Peugeot: 206 - 306 - 307 - 406 - 806 - Expert - Partner (2.0 HDi 1999 - 20. ).

www.ebay.co.uk

hd3 · 2025-02-04T14:18:31+0000

Dollywasasheep said:
It's now coughing and dieing now and again, I have yet to plug it back in,

1] see above what Arctic-2 wrote ..
as a generic diagnostic box might display ' rail pressure sensor ' .. but might not be totally accurate.

re:
"I have yet to plug it back in,"
to clarify .. you can start it .. and it will idle somewhat with the rail sensor disconnected ??
but will cough and stop running ..
that seems to rule out the actual rail sensor as the issue, as the td4 once running,
will operate and drive with the fuel rail sensor being disconnected .. albeit with lottsa smoke and diesel knock.
[ the ecu provides a default fuel pressure map ]

'tis sounding more like the hp.pump fuel regulator o-rings as Arctic-2 suggests.

the term 'fuel rail sensor' and 'fuel pressure regulator' often get mixed up
when looking online ..

Dollywasasheep said:
managed to borrow a diagnostic box from work,

did the box display an actual fault code ??

.........................................................................

Alteredtech · 2025-02-04T15:43:52+0000

Dollywasasheep said:
Thanks hd3 well at least I got that bit right.

It's now coughing and dieing now and again, I have yet to plug it back in, but wondered what you may think is casuing the issue, the sensor was my next go to.

Hi,

The best that you can do, plug the diag tool, take a full screen picture of the fault reading, post it there !

Regards

Dollywasasheep · 2025-02-04T19:30:32+0000

hd3 said:
1] see above what Arctic-2 wrote ..
as a generic diagnostic box might display ' rail pressure sensor ' .. but might not be totally accurate.

re:
"I have yet to plug it back in,"
to clarify .. you can start it .. and it will idle somewhat with the rail sensor disconnected ??
but will cough and stop running ..
that seems to rule out the actual rail sensor as the issue, as the td4 once running,
will operate and drive with the fuel rail sensor being disconnected .. albeit with lottsa smoke and diesel knock.
[ the ecu provides a default fuel pressure map ]

'tis sounding more like the hp.pump fuel regulator o-rings as Arctic-2 suggests.

the term 'fuel rail sensor' and 'fuel pressure regulator' often get mixed up
when looking online ..

did the box display an actual fault code ??

.........................................................................

Alteredtech said:
Hi,

The best that you can do, plug the diag tool, take a full screen picture of the fault reading, post it there !

Regards

Hi Guys

Plugged the diagnostics box back in and found these codes, cleared them all car started perfectly, ran it up to temperature and a few minutes later starts coughing and dieing repeatedly. Plugged the box back in and got the rail pressure sensor fault code again.

Thanks for your help, I’ve not worked on my cars for years and it’s taking some getting my head around it.

Alteredtech · 2025-02-04T20:36:11+0000

Hi

For P1110 look next to the oil gauge, there should the air temp sensor unpluged, try to find the wire, somewhere …

With the P0190 code, the car start perfecty ? With the engine cold and a stable idle ?

If the car start, the fuel rail sensor should be working ( should give you a value with diag tool ) so could be the High pressure pump regulator o ring, can be also a bad injector …

Can you read the high fuel presure pump with your diag tool ?
You can do a leak back return test for testing the injectors.

Fuel Rail Pressure Sensor

Dollywasasheep

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hd3

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TD4 fuel rail pressure sensor queries

Dollywasasheep

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Arctic2

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Citroen Xantia 2.0 HDi Common Rail Pump Pressure Regulator seal kit Bosch x 1 | eBay

hd3

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Alteredtech

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Dollywasasheep

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Alteredtech

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