Carl, thanks for your prompt response. The impurity that worries me most is the iron filing from the internal walls of the tank.
In the past Hyundai forklift were equipped with the filter VF300 and we use to open the filter and regulator each 500h for cleaning, replacement of filter element and membranes. The new models have no longer this filter which should shorten the maintence intervals what we want to avoid.
As there is not much space close to the regulator to install the filter my major concern is the lost of pressure of the LPG and the freezing of fuel before reaching the regulator. What do you think?
Regards