It's not really answer to what you are asking, however.... We have a 1999 forklift truck at work. It is a proper LPG model, not a converted machine. The moderators take a dim view of profanity on this site so it will be difficult to acurately describe this machine. Carb icing, lack of fuel capacity and hard work to fill the tank. It is also twice as expensive per hour to feed it on LPG than if it ran on normal red diesel. LPG is the fuel of satan

It's not really answer to what you are asking, however.... We have a 1999 forklift truck at work. It is a proper LPG model, not a converted machine. The moderators take a dim view of profanity on this site so it will be difficult to acurately describe this machine. Carb icing, lack of fuel capacity and hard work to fill the tank. It is also twice as expensive per hour to feed it on LPG than if it ran on normal red diesel. LPG is the fuel of satan

I know this is an old thread but...................

Icing on the LPG unit is poor coolant or air blockage vent and top up & check flow into carb unit from gas unit on the forklift.

Run up when air leaked all should be fine if still freezing you have a crackred unit, Nikki units are good Beam are ok but cheap.

I am in Australia and run a 4lt Ford Falcon wagon with LPG fitted as a dual fuel conversion. It has the gas filler under the flap beside the petrol filler. All neat and tidy. You need to talk to the conversion people about that before you decide who to get to do it. Another thing to talk to them about is what sort of fuel gauge they supply. The older ones just have 4 lights which gradually go out as your gas goes down. Not very satisfactory. I am told that newer ones have a proper fuel gauge. Mine has the lights so I use the trip odometer to tell me when it is getting low.

Conversions come in at least 3 basic types. You have the old style mixer units which were cheap but not terribly efficient. I don't think they are used these days. I have a vapour injection unit. It works very well for me. It loses a little bit of power compared with petrol but with a 4lt DOHC motor you don't notice that. It might be different with a Kombi van. The latest system is liquid injection. It is supposed to be really good with little or no loss of power.

You should get onto the LPG forums to check out what to use. Also check out who does a good conversion. Some are very neat - others less so.

I have had my conversion about 6 years now and have never regretted it. It has saved me heaps and it certainly isn't messy to fill up.