One thing with LPG trucks is the anti-freeze. If the coolant system is low on anti-freeze and mainly water it may freeze up in the vaporizer.
This cuts down the flow of water through the vaporizer.
I've had this happen loads of times over the years.

Hello. Did you manage to find a better gas supplier?

UK, has anyone heard of any action taken against the major LPG suppliers. We have 3 machines breaking down monthly at £300-£400 each per time.

Going to experiment with using an alternative supply on one machine to see if it makes any difference.

HD-5 LP is what the book calls for. Does anybody have experance with HD-10?

We're are having massive issues with lpg quality and have issued several safety alerts over this issue

Thanks swoop223. In both instances the customers were using a bulk gas supply for their respective sites from 2 of the UK's leading suppliers. One was using Calor Gas & the other Flogas. Thanks for your insight.

hi supertony,
yes we have that issue over here in the states too.
the problem is oil in the gas that gets inside the vaporizer and clogs it up. Yes all LPG has a certain amount of oil mixed with it to supply lubrication and odor to the gas.
in our factory training one of the steps in a maintenance operation is to remove the plug out of the bottom of the vaporizer and let the oil drain out of it.
it seems the reason the oil is getting into the tanks is the LP supplier is not draining their own supply tanks or not filtering it like they should so when they fill the small tanks they get a lot more excess oil in them. This is contaminating the forklift system more than usual causing the starting/running issues.
And yes, most of the time they will deny this, once in a blue moon you might find a distributor that admits to it and tries to keep that from happening.
HD5 is the recommended grade of LPG for most machines so that might be something to consider asking the supplier about. (this is usually the customer's responsibility but you should make sure they know it, customers will try to buy the cheapest they can find but i've found quite a bit that the cheap gas is not HD5 even thought the supplier claims it is).

Here in the UK we are having issues with Gas Vaporizers from a "cold start" point. We believe that this is due to LPG quality issues but the LPG suppliers are denying this. Anyone else experiencing this problem?

wow thanks for the lesson this is cool

it is a liquid propane gas converter
liquid propane enters, is heated by the coolant flowing through the outside chambers and causes the liquid to evaporate into a gas/vapor which is then distributed to the mixer on the engine which regulates the fuel flow allowing the engine to run in a controlled manner.
ie: it turns liquid into a gas/vapor