Range Rover Sport apparent fuel/fuel pressure issue(s)?

[Oliver F Baer]

Hello -
I have a 2011 Range Rover Sport HSE (L320) with an apparent fuel or fuel pressure issue. Mileage is 180,000. Three years ago I replaced one of the high pressure fuel pumps because it was running rough and diagnostics indicated that one of the banks was low on pressure. Fast forward three years and approximately 80,000 miles. One morning it just did not start. Fuel pressure - or lack thereof - came to mind. Diagnostics pointed to the low pressure pump. Tank was dropped and the low pressure pump was replaced. It started, ran but occasionally stalled. As a "preventive measure", the two high pressure pumps were also replaced. The apparent fuel pressure issue persisted. Tank was dropped again and the low pressure pump was found to be defective. New pump installed. Car started and ran perfectly.

Fast forward one day and the car did not start.

Any ideas on what might be causing the apparent fuel or fuel pressure issue? High pressure pump actuator? Leak in fuel system? Filter?

Thank you in advance.
Oliver

 

[ftillier]

I would expect there to be fuel filters in the system - have those been replaced? Perhaps there's enough crud that they are restricting flow? I don't know if the fuel filter is integral to the low pressure pump, though - perhaps it is. Have you run any fuel system cleaner over time?

 

[Oliver F Baer]

I would expect there to be fuel filters in the system - have those been replaced? Perhaps there's enough crud that they are restricting flow? I don't know if the fuel filter is integral to the low pressure pump, though - perhaps it is. Have you run any fuel system cleaner over time?

Thank you for the reply. Yes, the fuel filter assembly was suspected too and replaced.

 

[Oliver F Baer]

Is there a port (or fitting) to check to the existence of fuel and/or fuel pressure? I am also trying to diagnose it with In Car Doc Pro to check fuel pressures.

 

[Jimmy Brooks]

Hello -
I have a 2011 Range Rover Sport HSE (L320) with an apparent fuel or fuel pressure issue. Mileage is 180,000. Three years ago I replaced one of the high pressure fuel pumps because it was running rough and diagnostics indicated that one of the banks was low on pressure. Fast forward three years and approximately 80,000 miles. One morning it just did not start. Fuel pressure - or lack thereof - came to mind. Diagnostics pointed to the low pressure pump. Tank was dropped and the low pressure pump was replaced. It started, ran but occasionally stalled. As a "preventive measure", the two high pressure pumps were also replaced. The apparent fuel pressure issue persisted. Tank was dropped again and the low pressure pump was found to be defective. New pump installed. Car started and ran perfectly.

Fast forward one day and the car did not start.

Any ideas on what might be causing the apparent fuel or fuel pressure issue? High pressure pump actuator? Leak in fuel system? Filter?

Thank you in advance.
Oliver

Maybe this is an obvious question but any codes? I’ve been chasing an issue with my 2010 LR4 that involves it not wanting to start but once it cranks over it runs fine with no codes and no issues with stalling, wonder if your issue is similar. I first thought it was a fuel delivery issue but I’m now aiming towards a voltage issue. Anyway would love to hear how you diagnosed the LPFP because I’m still trying to diagnose my issue.

 

[Oliver F Baer]

Maybe this is an obvious question but any codes? I’ve been chasing an issue with my 2010 LR4 that involves it not wanting to start but once it cranks over it runs fine with no codes and no issues with stalling, wonder if your issue is similar. I first thought it was a fuel delivery issue but I’m now aiming towards a voltage issue. Anyway would love to hear how you diagnosed the LPFP because I’m still trying to diagnose my issue.

Initially a mechanic read a code, not sure which one, that pointed to the LPFP. It ran for one day then died again. Now I am fixing it. The latest historical code is a P0116 which is an unrelated ECT error. Now there are no current codes. Not sure what to do next, except check the pump connections and check the CPS.

 

[SMorelli]

I have a 2015 LR4. It started to stall at low revs predominantly in the cold weather and within 10 mins of the first start of the day. Always as I tried to pull away at a junction or traffic lights.

It threw mainly low fuel pressure codes and the display would often switch to the al terrain page. It always re-started and usually ran all day with no issue.

I looked at everything obvious including the fuel relay (it was clicking in & out) in the fuse board to avoid spending $$$.

The first summer the problem disappeared and reappeared in winter. Once started and stalled it seemed like it would run no problem all day and never stalled at speed.

The following summer it continued to stall with increasing frequency. I had a code for O2 sensors and they were due so changed them. This did not fix the issue.

I put it into a specialist in Jan 2023 (very cold at this time of year in Canada) he said it runs fine and wanted to buy it from me. ($500 for driving it back and for to work for 3 weeks!!!!) It stalled two days later and continued to do so including not even starting until the weather got above -10DEGC.

Frustrated I put it into a garage that I trust and had him change Low pressure fuel pump, low pressure sensor, low pressure pump controller & High pressure/temp sensor.

Still it stalled!!!!!!!!

I changed the fuel cap in case the tank was Vacuuming........still stalled!!

I went back to the workshop manual and reviewed the low-pressure system and the only part I had not replaced was the fuel relay but I could still hear it clicking in and out.

A little further research on relays and I found a source that said never trust that just because its energizing that its good.

I removed the relay and energized it with a 12 battery and measured the resistance across the contacts. Each time i energized it the resistace jumped from 0 Ohms (good) to sometimes 600 Ohms (bad).

Bingo!!!!!! the intermittent failure was dirty/bad contacts on the relay that feeds the low pressure fuel pump controller.

I opened up the relay and confirmed this was the issue and even cleaned them with brake cleaner. I then swapped the relay with the same on that feed the blower to test my findings and the problem vanished.

I bought two new relays from LR $35ea and now have my car running like a watch!!

I learned the hard way, I hope this helps you guys. Just swap the relays to test yours, no big deal if the blower doesn't work if it proves the issue.

 

[SMorelli]

Initially a mechanic read a code, not sure which one, that pointed to the LPFP. It ran for one day then died again. Now I am fixing it. The latest historical code is a P0116 which is an unrelated ECT error. Now there are no current codes. Not sure what to do next, except check the pump connections and check the CPS.

Post in thread '2015 LR4 Stalling when cold - Low Fuel Pressure Fuel codes etc.'
https://www.landroverworld.org/thre...uel-pressure-fuel-codes-etc.45180/post-246376

 

[SMorelli]

Hello -
I have a 2011 Range Rover Sport HSE (L320) with an apparent fuel or fuel pressure issue. Mileage is 180,000. Three years ago I replaced one of the high pressure fuel pumps because it was running rough and diagnostics indicated that one of the banks was low on pressure. Fast forward three years and approximately 80,000 miles. One morning it just did not start. Fuel pressure - or lack thereof - came to mind. Diagnostics pointed to the low pressure pump. Tank was dropped and the low pressure pump was replaced. It started, ran but occasionally stalled. As a "preventive measure", the two high pressure pumps were also replaced. The apparent fuel pressure issue persisted. Tank was dropped again and the low pressure pump was found to be defective. New pump installed. Car started and ran perfectly.

Fast forward one day and the car did not start.

Any ideas on what might be causing the apparent fuel or fuel pressure issue? High pressure pump actuator? Leak in fuel system? Filter?

Thank you in advance.
Oliver

Post in thread '2015 LR4 Stalling when cold - Low Fuel Pressure Fuel codes etc.'
https://www.landroverworld.org/thre...uel-pressure-fuel-codes-etc.45180/post-246376