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Danwilderspin



Member Since: 15 Jun 2016
Location: Cambridgeshire
Posts: 1849

United Kingdom 2007 Range Rover Vogue SE 4.2 SC V8 Zermatt Silver
4.2 owners with lpg quick question?

Hi all,

My conversion was done a while ago but mainly my fault I’ve not been able to get it 100% done.

Basically they tried to use an emulator to simulate the fuel pressure which didn’t work so as a temporary fix they left one cylinder on petrol and it runs fine, however just wondered what you guys have - an emulator that works(if so which?) or a fuel return?

Cheers Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

Post #544372 18th Feb 2020 10:59pm
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dingg1



Member Since: 29 Jun 2013
Location: PORTUGAL
Posts: 889

2007 Range Rover Vogue SE 4.2 SC V8 Stornoway Grey

Must have a fuel return.
If your installer wanted to emulate the fuel pressure be wary about the quality of the rest of the conversion.

Post #544390 19th Feb 2020 10:17am
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Danwilderspin



Member Since: 15 Jun 2016
Location: Cambridgeshire
Posts: 1849

United Kingdom 2007 Range Rover Vogue SE 4.2 SC V8 Zermatt Silver

The fuel return is what they want it back for - but out of curiosity why is an emulator bad? is it a pressure in tank issue? Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

Post #544394 19th Feb 2020 10:39am
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dingg1



Member Since: 29 Jun 2013
Location: PORTUGAL
Posts: 889

2007 Range Rover Vogue SE 4.2 SC V8 Stornoway Grey

Your fuel pressure is just one of the parameters that gets fed to the ecu to determine injection timing if its wrong by a considerable amount, it will be without a fuel return fitted, your engine will not run properly and you will end up running rich or lean or just end up chasing your tail to resolve, you MUST have a fuel return fitted with an in line orifice to replicate how the fuel pressure would be if running on petrol.

Change your installer as he should know all of this.

Post #544396 19th Feb 2020 11:00am
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lighthouse



Member Since: 22 Feb 2016
Location: Great Notley
Posts: 500

United Kingdom 2011 Range Rover Autobiography 5.0 SC V8 Santorini Black

My advice don't do the conversion, mine eat itself to death, the vale seats are just too soft even with flash lube after 60k on gas one dead engine.

Post #545386 27th Feb 2020 9:59pm
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Danwilderspin



Member Since: 15 Jun 2016
Location: Cambridgeshire
Posts: 1849

United Kingdom 2007 Range Rover Vogue SE 4.2 SC V8 Zermatt Silver

What did you do with it lighthouse? As far as I was aware when the valve seats go it just makes it had to start and run rough until you to temperature where it then stabilises?

There are a fair few people with 100k plus on them so maybe it was down to the conversion? Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

Post #545636 1st Mar 2020 9:01am
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lighthouse



Member Since: 22 Feb 2016
Location: Great Notley
Posts: 500

United Kingdom 2011 Range Rover Autobiography 5.0 SC V8 Santorini Black

As described is how it is when it starts to happens, as they then wear more the start to leave gaps all the time get air into the cyclinders and causes misfires and then it gets to the point where the compression is so low the car is useless.

Post #545637 1st Mar 2020 9:04am
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