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PostPosted: Tue Aug 30, 2016 7:44 pm 
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Joined: Fri Mar 18, 2011 3:44 pm
Posts: 60
Location: Lincs
Hi All,

In 2002 I converted our 3.8 MkII Jaguar to LPG after finding it would only do 17mpg on petrol and only a slight improvement to 22 mpg with another distributor.

I had intended to do at least 5000 mile a year in it but of late it has only been 1200 and occasionally 3000 on holiday but could not find any gas stations.

Since 2004 I have had to service and adjust the system on my own but the other week another older guy had a look at my system and stated what appears obvious now:

My liquid line from the tank is too small needs 8mm rather than my 6mm line.

The engine bay shut off valve is too small.

Although this is not expensive, with the petrol runs and oil burning of this old engine ruining the lambda probe each year and running on Iridium plugs to get some reliability, the savings on such low mileage don't outway the costs.

It was with a heavy heart that I have accepted the inevitable and removed the tank, fuel lines, mixers and the vapouriser. The cables will take longer to remove.

I would like to say thanks to those who have tried by the forum to help me find my back firing problems. I still think LPG is the way forward, but my health precludes any further adventures with gas.

Thanks again


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PostPosted: Tue Aug 30, 2016 8:28 pm 

Joined: Wed Sep 29, 2010 5:01 pm
Posts: 3220
Location: Yorkshire
I hope removing the LPG system wasn't too hasty... With a mixer system the 6mm line should have been adequate, very likely the solenoid adequate too (or cheap to swap to one that is), if lambdas a regular replacement due to an oil burning engine you could have fitted a manual flow valve in place of the stepper controlled flow valve and run the engine open loop, doing away with the need for lambdas.

Dunno if I helped in the past, very welcome if I did and I'm sure others would say the same.


Full time LPG installer
Servicing / Diagnostics / Repairs to all systems / DIY conversion kits supplied with thorough tech support
Mid Yorkshire
2 miles A1, 8 miles M62,
Twitter https://twitter.com/AutogasSimon

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PostPosted: Thu Sep 08, 2016 2:31 pm 

Joined: Fri Oct 21, 2005 7:56 pm
Posts: 2595
Location: North Wales
Shame you got to the point of pulling the system off. A 6mm feed line is plenty big enough on 5 ltr engines running mixers.

I suspect your problems were either down to mixers or vapouriser. As Simon pointed out if you went open loop with a manual adjuster you would not need the lambda sensor.

http://www.classicswede.co.uk/LPG/cat17 ... 10800.aspx

LPG installer Anglesey North Wales



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