Hi everyone
So I was wondering if anyone can help as I am really really struggling with are much hated / loved sport which for almost the last three years has had this mystery’s untraceable low fuel pressure fault on hard ish acceleration or lately some times just driving when the car has warms up causing limp mode.

I’ll try and keep it short as over the last three years it’s a very long story !
the vehicle is a 2007 Range Rover sport 2.7 tdv6 with only 86,000 miles one day the high pressure fuel pump faulted suddenly causing the vehicle not to start so I personally replaced the high pressure fuel pump and the injection with genuine Land Rover / VDO pump and injectors, all went fine and the car fired up straight away “ all fixed or so I thought / where all the fun began !! “ after about ten minutes of driving the car out the shed and letting it sit running in went in to limp mode for “ high fuel pressure “ and then when I tried driving it when you accelerated over 2,500 rpm for a few seconds it would go straight in to limp mode again this time for low fuel pressure!.

After struggling for a few months I then put it to my local garage that works on Land Rover most weeks they had it for two months and couldn’t understand why it was showing low pressure on the rail under acceleration then some days high pressure on the rail when left idling so they gave up with it !.

Them it want to a local Land Rover specialist over 100 miles away they had it for OVER 7 MONTHS and couldn’t fix it ! , they then changed the intank fuel pump , fuel rail pressure sensor, two fuel filters , return pips , but couldn’t get the fuel pressure to meet spec at any rpm always far too low and constant rising and failing , so they also had to give up and transport the vehicle back to me !

So eventually I then decided to have it transported to my nearest Land Rover mean dealer who have had it OVER 6 MONTHS now returned it twice “ fixed “ but I only got 30 miles the first time before going in limp mode took it straight back seconds time only 10 miles before limp mode and again straight back with it but now they are really stumped and have not touched it in months ! after spending thousands with them they also can’t fix it.
Over that 6 months they changed the high pressure fuel pump again , the intank fuel pump again , fuel pressure sensor again , fuel filters again , and engine ECU , also tested all the wiring multiple times but can’t find the root cause.

So yeah sorry for this long jumbled story tried to keep it short ish but if anyone has had something similar or has any ideas it would be greatly appreciated! ,it is so annoying how no one can fix this it’s costing an absolute fortune! and no other garages I’ve tried will even take it now !

Fault codes
P0087-00
P0088-00
P2290-00
P000E-22
And much more !

Thanks James

Try changing the fuel cap on your fuel tank

Hi thanks for your reply

Yeah we have already ruled that out by driving with the cap off and had the 2 tank breathers checked when the tank was dropped to change the fuel pump. 2017-Discovery 5 TDV6 HSE
2007-Range Rover sport “ endless money pit “
2005-Discovery 3

You need to put a pressure gauge onto the fuel rail to make sure that you are “really” getting correct pressure readings

Hi !
Well the car is currently back at the dealer for the third time , I would of hoped that they would of already checked the rail pressure with a gauge on the bleed valve before they changing the fuel pumps “ but you never know “ ! . I’ll have to ask them if the rail pressure is matching what the diagnostics is showing , but they have already changed the pressure sensor and tested the sensor wiring back to the ECU and to the fuse box so I would hope that the sensors readings would be accurate ?. 2017-Discovery 5 TDV6 HSE
2007-Range Rover sport “ endless money pit “
2005-Discovery 3

Have they replaced the rail the fuel pressure sensor goes into? Just curious as it’s been revised twice. Could also have something in it from the fuel pump failure. That’s where I’d be looking with the list of things you’ve done so far. 2011 RRS HSE Luxury 3.0 TDV6 Fuji White on Ebony/Ivory
Born and raised in So Cal. Moved to the UK in 2018 for a few years. Now in Poland and looking at moving back to the UK.

I am currently away overseas from home, so I cannot be 100% sure. But something like the GapII tool may be able to monitor fuel pressures in real-time. That would be of help hopefully.

NoExpert wrote:

Have they replaced the rail the fuel pressure sensor goes into? Just curious as it’s been revised twice. Could also have something in it from the fuel pump failure. That’s where I’d be looking with the list of things you’ve done so far.

erickwan wrote:

I am currently away overseas from home, so I cannot be 100% sure. But something like the GapII tool may be able to monitor fuel pressures in real-time. That would be of help hopefully.

Hi
Yes I got an IID TOOL like 5 years ago , one of the best things I ever bought especially when you have two Land Rovers it’s almost used weekly !

It’s great for reading the fault codes and looking at live data but all I can tell is that the fuel rail pressure is running two low ,starts of fine at 27,000 kpa once the car is first started but after a few minutes of driving the pressure slowly drops down the only 23,000 kpa and it shows very rough pressure when left to ideal ?
So yeah it’s great but don’t think it can help point to the cause ?

Photo of the fuel pressure after car has warmed up and been restarted “ pressure graph are always just rougher once car has warmed up “ 2017-Discovery 5 TDV6 HSE
2007-Range Rover sport “ endless money pit “
2005-Discovery 3

So I was hoping to have my car back over three months ago now as at the time I was told that they where going to change the “ nonreturn fuel valve on the top of the fuel tanks “ never heard about this valve before but they belevied it was letting too much fuel return back in to the tank form the T Peas at the filter housing. Once this was changed the car then needed road testing but of course it had run out of mot so it needed retesting before any road tests could be done apparently, but of course the car failed its mot just on little things really , two tyres where cracked probably for sitting in one place for so long ! , two brake hoses , one drive shaft boot , and both headlights where pointing too low .
This then took them like two months to get the work done and some time to get the mot bill heavily reduced.
And after all that I’ve just phoned again today to ask if any road tests have been done yet and after being on hold a worrying long time was told that the car faulted on the road test and mite be back in the workshop by the end of the week.

Like oh my god is this ever going to end they have had it off and on for over 12 months now it has been to other specialists why can’t no one find this low fuel pressure fault.

Think this car has just had enough of being a car and just wants to sit pretty anywhere ! 2017-Discovery 5 TDV6 HSE
2007-Range Rover sport “ endless money pit “
2005-Discovery 3

So if it’s not the fuel pumps not injectors not the wiring not the rail sensor not the fuel lines not the ecu not the non-return valve not the filters.
What is left !
What are they all missing that’s the fault ? 2017-Discovery 5 TDV6 HSE
2007-Range Rover sport “ endless money pit “
2005-Discovery 3

Engine ECM

Hi , thanks for your thoughts

But the engine ecu / pcm has already been changed , the Land Rover dealer said it was at fault but they where unable to order one as it’s been discontinued and would cost about £1500 pound
So I took the car back and got a second had ecu for £50 pound and recoded and fitted it my self but of course it made no difference to the car so the Land Rover dealer took it back as they where wrong again. 2017-Discovery 5 TDV6 HSE
2007-Range Rover sport “ endless money pit “
2005-Discovery 3

So after speaking to the master technician again today the low pressure system seems to be fine as it’s showing 0.5 bar on the pressure gauge on the bleed valve but he still thinks when test driving it’s feeling like it’s not getting enough fuel , so if it’s getting 0.5 bar what else could be perverting it from building fuel pressure when accelerating ?

They have tested all the wiring again for a third time and swapped injections for a working car but no difference

Brand new high pressures fuel pump and a new fuel pressure sensor ?
All wiring fine new plugs on the wiring too ? 2017-Discovery 5 TDV6 HSE
2007-Range Rover sport “ endless money pit “
2005-Discovery 3

For completeness, the fuel pressure does not tell a complete story. The delivery volume also needs to be measured.

If the engine is not getting sufficient fuel supply on acceleration, one suspect is the FVCV or its associated electrical circuitry.