pulled the spark plugs and found several different ones are used!! not good!
I seem to recall BRP6E or BRP6ES are the plugs that should be in, but i've just seen RPI sell BCPR7ES anyone know why they sell 7 rather than 6? does LPG prefer a colder temp plug?
 
bit more research and consensus seems to be bpr6es are ideal, bpr7es is better for lpg but they have a tendency to foul up easier as they burn cooler
Having owned 3 LPG duel fuel vehicles i can honestly say they are brilliant " IF SERVICED WELL ". An engine will indeed run slightly hotter whilst on LPG but all 3 of mine were great and i never had any issues on all 3. I did use BOTH fuels all the time as its NOT best practice just to use LPG all the time just in case it goes wrong and you need the primary fuel source. I gave mine a good service each year and always took the plugs out to check them, clean or replace them if i felt they needed doing so. All mine had valve lube systems too. Plenty of dodgy installers out there selling them for less than £1000 and after a few months or less than a year the engines blow up. All mine were LPGC certified too and added to the DVLA register. Sadly the DVLA never afforded me an road tax discount and they still don't today the tight gits.

Some folk think LPG gives you " double the mpg " too which is bollox. All it gives you is a cheaper alternative fuel to buy along side petrol and double the max range dependant on the size of your LPG tank. I also found too that my 35 ltr tank on my little " sooty van " would only ever take a max fill of 32 litres and no more. Ullage i think they call it to allow for expansion during hot weather. I could hardly tell the difference between running on either too. I had 2 x Prinz systems which are the best and the other on my American Chevy Astro day van was an OMVL system which was a really good system too. All i ever changed on the LPG side each year was the inline filter and i never had any issues at all with any of them.

I was lucky to have 3 LPG outlets too in Swindon to go to for gas where as they are usually hidden away or part of the farmers union which you can join and get a map book showing all the filling point stations up and down the uk.

A good option to have on any Range Rover if fitted properly. A top end valve lube system today fitted properly and discreetly with full certification by a reputable installer should be between £1800 - £2500 and if the car is used on a regular basis exceeding 15000 miles a year it will pay for itself in about 2 years i would say. Other than that its not worth bothering with the initial outlay fee and always best to find a car with it already fitted and working correctly remembering also that having LPG fitted DOES NOT mean the vehicle is worth more come sale time. In fact it can actually go against a car in terms of its value as most folk are often very wary of a car fitted with it when it comes to engine life.
 
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I also found too that my 35 ltr tank on my little " sooty van " would only ever take a max fill of 32 litres and no more. Ullage i think they call it to allow for expansion during hot weather.
I'm surprised you managed to get that much in a fill, the rule of thumb is usually around 80% (liquid) but it depends on temperature, like you say and also the state of the filling station tank
 
I'm surprised you managed to get that much in a fill, the rule of thumb is usually around 80% (liquid) but it depends on temperature, like you say and also the state of the filling station tank
Indeed buddy. It was different also on the other 2 as they had bigger tanks as they were both bigger vehicles. The " Sooty van " was all factory fitted too and came off the line as a duel fuel vehicle where as the other 2 i had were converted albeit both with top systems i might add hence the long term trouble free reliability. I would never say no to another that is for sure but i would also never pay out to have one fitted either as it would not be cost effective for me personally.
 

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