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dxa
Member Since: 25 Aug 2016
Location: MK
Posts: 30
  
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| Steps to DX a HPFP failure |
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Who here can give me tips on normal diagnostic procedure when it comes to HPFP failure?
Usual symptoms - intermittent limp mode, usual bings and bongs, reset fixes it for X miles and then it happens again ( sometimes almost immediately)
Is it a case to normally replace the fuel rails inc pressure sensor, then the LPFP? followed by HPFP?
Or can you actually make a diagnosis by checking PSI on valves etc?
Garage have had the car for 2 weeks, and have done the above replacements and have seem to have done process of elimination rather than Diagnostic work as requested before work started.
TIA!
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 7th Apr 2017 12:57 pm |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8121
  
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Without a good fault code reader and live values you and they are shooting in the dark. When do these faults occur?
Ideally you need someone with an Iid tool to diagnose and post the findings. It can when others can't,
It will when others won't,
It goes where others don't.
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| 7th Apr 2017 1:30 pm |
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dxa
Member Since: 25 Aug 2016
Location: MK
Posts: 30
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Sorry, had a fault code reader on it. i cant remember the exact code but it was consistently related to low pressure on fuel rail. Numbers were fluctuating around 23-24XXX
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| 7th Apr 2017 1:32 pm |
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dxa
Member Since: 25 Aug 2016
Location: MK
Posts: 30
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P0087
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| 7th Apr 2017 2:10 pm |
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KostasA
Member Since: 23 Aug 2015
Location: nairobi
Posts: 286
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i had same fault as you, according to LR this is HPFP especially when it comes with limp mode and a big F on the dashboard. Now HPFP can be either the actual pump or not getting enough flow flow from the LPFP (hence to avoid cavitation is cuts the HPFP). As far as i know there is no fault code for LPFP. There is a procedure that is very well analysed by Robbie on how you measure the LPFP. My addition to that is don't take those numbers as absolute number but read the other post as well.
if you eliminate the LPFP yes you can change the fuel pressure switch on the fuel rail but most likely won't make you smile. Most likely you ll have to replace the HPFP, it is not super difficult it requires some time but it is very straight forward job.
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| 7th Apr 2017 2:36 pm |
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dxa
Member Since: 25 Aug 2016
Location: MK
Posts: 30
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Yes i know it can be one of those 3 things but i am sure having read there are ways to distinguish between the 3 rather than doing all 3 things and passing on the cost to the customer?
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| 7th Apr 2017 5:32 pm |
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dxa
Member Since: 25 Aug 2016
Location: MK
Posts: 30
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And yes, now moving the car to another garage and having the HPFP replaced, having already lost time and money at the original garage and 2 weeks of my time being completely car-less!
Not impressed with this indie not doing proper DX work and just using the Landrover helpdesk and error codes, and process of elimination, instead of differentiating between LPFP and HPFP.
I also now have a scrap fuel tank replacing my totally functional LPFP, fuel burner and tank which i did not ask for nor want 
The sensor on the rails they tried to tell me was a common issue and should be replaced first. Funnily enough i couldnt find one instance on here where they were the culprit for low fuel pressure.
Absolutely steaming at these guys!
Am i wrong?
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| 7th Apr 2017 5:36 pm |
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urhunden
Member Since: 15 Jan 2010
Location: Stockholm
Posts: 778
 
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How hard should you tighten the fuel pressure sensor????
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| 7th Apr 2017 10:12 pm |
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KostasA
Member Since: 23 Aug 2015
Location: nairobi
Posts: 286
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dxa, the steps that i would follow if from the cheap to the most expensive. of course the cheapest thing is to change the sensor first and then check which of the pumps has the problem.LPFP is cheaper than the HPFP. of course one has to measure and see if the problem is caused from back to front. live data were not very helpful to me, instead measuring the LPFP is really straight forward.
Personally i misread the forum and changed the LPFP and then after having problem again changed the HPFP. In any case now can really retreat that as i am sure that all my pumps are working properly.
Urhunden, i don't know the actual number just tight it to the level i think is ok.
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| 8th Apr 2017 6:02 am |
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urhunden
Member Since: 15 Jan 2010
Location: Stockholm
Posts: 778
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Measured the system:
LPFP current at fuse. 4,3 A steady
Pressure at valve. 4,7 psi. steady needle going down with higher revs
from IID
fuel pressure at idle 3500 psi going up when pushing throttle
fuel rail temp 70 degrees
Are these values normal?
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| 8th Apr 2017 7:20 am |
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dxa
Member Since: 25 Aug 2016
Location: MK
Posts: 30
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Thanks all
the garage did NO diagnostic to differentiate between LPFP and HPFP thats why i am  at them! i took the car to another garage.
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| 10th Apr 2017 11:25 am |
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davemh_80
Member Since: 17 Jul 2010
Location: Sydney
Posts: 16
 
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| Replace HPFP? Replace FPS? |
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KostasA wrote:dxa, the steps that i would follow if from the cheap to the most expensive. of course the cheapest thing is to change the sensor first and then check which of the pumps has the problem.LPFP is cheaper than the HPFP. of course one has to measure and see if the problem is caused from back to front. live data were not very helpful to me, instead measuring the LPFP is really straight forward.
Personally i misread the forum and changed the LPFP and then after having problem again changed the HPFP. In any case now can really retreat that as i am sure that all my pumps are working properly.
Urhunden, i don't know the actual number just tight it to the level i think is ok.
Hi KostasA, I'm looking for some info on how to remove/replace the HPFP. Looks like you have some experience with this. Is there a post or something you could direct me to on the topic? Also was wondering about the Sensor replacement. There is mixed opinions on this throughout the blogs - some say its integral to the HPFP. Others say its on the fuel rail which can be replaced. Can you advise? Any pointers would be greatly appreciated. Dave
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| 15th May 2017 10:20 pm |
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