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kirton



Member Since: 24 Jan 2014
Location: Crediton
Posts: 28

England 2006 Range Rover Autobiography 4.4 V8 Zermatt Silver
Fuel Pump problem caused by LPG?

The engine management light came on om 2006 4.4 petrol engined Range Rover earlier this week. Diagnostics showed it was running lean and suggested changing the fuel pump. The pump is situated in the fuel tank and is lubricated by the petrol itself (so I am told). So far I have done 26,000 miles on my LPG conversion and it dawned on me that the pump may be getting a bit sticky through lack of use. I have decide to run on petrol only for a tankful and see if that works. So far the management light has stayed off. If it stays off my plan was to run on a tankful of petrol every three months or so to keep the pump lubricated.

What do you all think? I am certainly no mechanic and would appreciate feedback.

Cheers. Smile

Post #417123 8th Dec 2016 1:43pm
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mr_spock



Member Since: 07 Apr 2016
Location: Welwyn, Hertfordshire
Posts: 304

United Kingdom 2003 Range Rover Vogue 4.4 V8 Java Black

Pumps do wear out. Your car will run on petrol until the water is warm enough to vaporise the LPG. On mine it takes a couple of miles at this time of year. I can't see how running a tank of petrol through will make much difference, but I guess you can try it.

Post #417126 8th Dec 2016 1:56pm
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dingg1



Member Since: 29 Jun 2013
Location: NEWCASTLE
Posts: 364

2007 Range Rover Vogue SE 4.2 SC V8 Stornoway Grey

kirton

you're barking up the wrong tree

your fuel pump runs continuously , when you first start up you will run on petrol anyway until the threshold temp is reached then the system switches to lpg , but your petrol pump continues to run - it aint getting 'sticky' at all

BUT what could be getting sticky is your gas injectors (happens in cold weather more often), maybe change lpg filters if it hasn't been done for a while and run some injection cleaner through the lpg system.

don't take it back to whoever diagnosed a new fuel pump was needed - unless there's more your not telling us

Post #417140 8th Dec 2016 3:34pm
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tb10



Member Since: 17 Feb 2015
Location: Bromsgrove
Posts: 194

England 2005 Range Rover Vogue 4.4 V8 Tonga Green

It won't be the petrol fuel pump that's sticking. The LPG may need recalibrating and it will be the sensors that are throwing the management light and thus the code when the LPG is being used.

I hope this helps.

regards

John

PS what LPG system do you have, how much LPG can you get in the tank and what range do you get?

Post #417144 8th Dec 2016 4:03pm
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daz62



Member Since: 27 Dec 2011
Location: Reading
Posts: 194

United Kingdom 2003 Range Rover Vogue SE 4.4 V8 Oslo Blue

FWIW my fuel pump packed up at about 120k miles so they do fail. No warning, no EML, the car just wouldn't start one day. 03 4.4 V8 petrol / lpg. 1st of many hopefully. I love my Rangie

Post #417173 8th Dec 2016 7:31pm
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Lukie



Member Since: 27 Sep 2016
Location: Liverpool
Posts: 343

2002 Range Rover Vogue 4.4 V8 Zambezi Silver

biggest culprit of fuel pump failure on LPG converted car's in general is lack of petrol in the tank, best thing to do is keep it over 1/4 at all times that way you should be safe

Post #417438 10th Dec 2016 10:32pm
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Haylands



Member Since: 04 Mar 2014
Location: North Ferriby, East Yorkshire
Posts: 4674

England 2002 Range Rover Vogue 4.4 V8 Epsom Green
Re: Fuel Pump problem caused by LPG?

kirton wrote:
Diagnostics showed it was running lean and suggested changing the fuel pump.


Don't know what sort of suggestion that was but may I suggest you find a new mechanic...

If it's running lean on LPG then there is one thing it CAN'T be and that is the PETROL fuel pump...!!!!

And as Dingg1 said, the pump runs all the time to cool the injectors when running on LPG, the petrol side gets enough use for the few minutes each morning before the LPG cuts in..

Lots of reasons why it will run lean on LPG and put the MIL light on, from holed diaphragm in the vaporiser to a blocked filter etc

Time to get the LPG system serviced and checked.... Thumbs Up Thumbs Up Pete
__________________________________________________
2002 V8 LPG Now gone BT IID TOOL. -CLICK HERE FOR BUILD THREAD-

Post #417513 11th Dec 2016 3:22pm
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kirton



Member Since: 24 Jan 2014
Location: Crediton
Posts: 28

England 2006 Range Rover Autobiography 4.4 V8 Zermatt Silver

Turned out to be a failing oxygen sensor.

Post #424424 23rd Jan 2017 3:32pm
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kirton



Member Since: 24 Jan 2014
Location: Crediton
Posts: 28

England 2006 Range Rover Autobiography 4.4 V8 Zermatt Silver

Replaced with a new Bosch sensor. Failed within 24 hours.
Fitted another Bosch sensor. Failed whilst still on the ramp!
Fitted Landrover Sensor. Seems Ok at present!! Confused

Post #426927 8th Feb 2017 6:45pm
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Dolphinboy



Member Since: 08 Dec 2009
Location: SW
Posts: 1580

United Kingdom 2004 Range Rover Autobiography 4.4 V8 Epsom Green
Car starts but stops after 5 secs

@kirton, how did you find out it was an oxygen sensor? What was the fault code? Cost to replace?

Also, @daz, what did you replace the pump with? BMW or OEM or LR? Do you have a part number? Where did you buy a replacement?

Was driving back from London yesterday and as the lpg ran out and switched to petrol, it was a little bit jerky on the uphill bits. Got home fine but now starts and runs for 5 seconds before stalling. Thinking probably pump failure but interested in any other suggestions such as oxygen sensor etc.

Post #429390 27th Feb 2017 2:12pm
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kirton



Member Since: 24 Jan 2014
Location: Crediton
Posts: 28

England 2006 Range Rover Autobiography 4.4 V8 Zermatt Silver

Dolphinboy,

I cannot recall the code diagnosing the failing sensor but one of the symptoms was when starting from cold, the engine would fire then stop. if I then restarted with a tiny amount of throttle it would settle down. After having the sensor replaced, a small airleak was also discovered which complicated things. Since then I have bought a Prodiag OBD2 diagnostic interface and OBD Car Doctor Pro and have set it recording the sensors and MAP and have found no problems. I can see it would be easy to replace an oxygen sensor which is OK when the real problem is a small air leak.

Post #429426 27th Feb 2017 5:32pm
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daz62



Member Since: 27 Dec 2011
Location: Reading
Posts: 194

United Kingdom 2003 Range Rover Vogue SE 4.4 V8 Oslo Blue
Re: Car starts but stops after 5 secs

Dolphinboy wrote:
@kirton, how did you find out it was an oxygen sensor? What was the fault code? Cost to replace?

Also, @daz, what did you replace the pump with? BMW or OEM or LR? Do you have a part number? Where did you buy a replacement?

Was driving back from London yesterday and as the lpg ran out and switched to petrol, it was a little bit jerky on the uphill bits. Got home fine but now starts and runs for 5 seconds before stalling. Thinking probably pump failure but interested in any other suggestions such as oxygen sensor etc.


Hi Dolphinboy,

I found the X5 bosch pump that looked like the one in the link http://www.ebay.co.uk/itm/For-BMW-X5-Range...1942820613

It was about 100 if memory serves. I fitted it a few years back, it is still going strong now.

There is a how to video on youtube, good luck

 03 4.4 V8 petrol / lpg. 1st of many hopefully. I love my Rangie

Post #429447 27th Feb 2017 8:01pm
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