Right I disconnected the return altogether and just run in petrol.

Did the same so I plugged in my snapon I get max 427kpa fuel rail pressure when it does it and I’m flat out - and it’s idles around 300kpa - does that sound about right or not?

Trying to work out if I can put the pump back together and work somewhere else or if I found the issue Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

Sounds low to me but I have no idea what it should be...  Pete
__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

Idle is about right from memory. Not sure what it should be at wide open throttle though.

David. 2002 4.6 Vogue SE - Alveston Red with Lightstone Leather
2012 Range Rover 5.0 SC Autobiography in Indus Silver with Jet/Ivory Interior
2012 Range Rover 4.4 TDV8 Autobiography in Baltic Blue with Sand Interior

Interesting I’m just sat here with key in pos 2 and rail pressure is now 520 Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

Also looking through the data I am getting misfires at high rpm mainly in cylinder 5 - 7 and a couple in 1 -1I doubt it will be plugs or coils as they are less than 10k old - only issues when hard driving as mentioned Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

Last edited by Danwilderspin on 22nd Jun 2022 7:00pm. Edited 1 time in total

I’m wondering if it stinks when you’re pushing it because it’s running lean and getting hot.

There’s no way the fuel pressure should drop at wide open throttle. At wide open throttle these things are using a huge amount of fuel so if the pressures dropping and it’s stuttering/hesitating then I’d say it’s definitely fuel pressure related.

The pressure regulator on these is built into the pump I believe as is the filter so I think I’d be having a look inside the tank next if I were you.

David. 2002 4.6 Vogue SE - Alveston Red with Lightstone Leather
2012 Range Rover 5.0 SC Autobiography in Indus Silver with Jet/Ivory Interior
2012 Range Rover 4.4 TDV8 Autobiography in Baltic Blue with Sand Interior

Haylands wrote:

Sounds low to me but I have no idea what it should be...

dhallworth wrote:

I’m wondering if it stinks when you’re pushing it because it’s running lean and getting hot.

There’s no way the fuel pressure should drop at wide open throttle. At wide open throttle these things are using a huge amount of fuel so if the pressures dropping and it’s stuttering/hesitating then I’d say it’s definitely fuel pressure related.

The pressure regulator on these is built into the pump I believe as is the filter so I think I’d be having a look inside the tank next if I were you.

David.

My money is still on the filter but that is just a guess....  Pete
__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

You might be right I don’t get why it can hold the correct pressure thought when not running if it was the filter, the filter is one of these filter for life in tank jobs I changed it about 10k ago i guess it could be bad bad the intakes for the pump have gauzes on them too Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

If you changed it that recently then that rules it out I recon...

Not a clue in that case, sorry.... Pete
__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

Ok, I cracked the rear o2 on the bank with the misfire (1) let it cool down for an hour and put my scope in the hole… I think this cat looks ok? Looks like some of they honeycomb has bits in but guess that’s ok?

If the consensus is yes the only thing I can try is to clean the filter - on the other Range Rover site they reckon you can do this with the filter on these cars ( should be fairly clean due to age anyway) and then I’ve got that two year old fuel pump with the failed jet unit so I may try and fit that at lunchtime at the same time as I’ve left everything open except the hole to the tank…

Any other ideas?

Also the plug in the picture is 12 months old not sure if it’s relevant but I thought I’d post a pic 😀

Click image to enlarge

It might be your camera but the innards of your cat are incredibly white. Every other car I’ve seen, my SC included the innards of the cats are much darker. 2002 4.6 Vogue SE - Alveston Red with Lightstone Leather
2012 Range Rover 5.0 SC Autobiography in Indus Silver with Jet/Ivory Interior
2012 Range Rover 4.4 TDV8 Autobiography in Baltic Blue with Sand Interior

I had to have the flash light on full brightness so I assume it’s just reflecting? I’m guessing colour wouldn’t cause a problem but may suggest one ? Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

When things get white it usually means they’ve been very hot. Running lean creates heat so could it be that it’s lean? I’m really not sure tbh. 2002 4.6 Vogue SE - Alveston Red with Lightstone Leather
2012 Range Rover 5.0 SC Autobiography in Indus Silver with Jet/Ivory Interior
2012 Range Rover 4.4 TDV8 Autobiography in Baltic Blue with Sand Interior