Nearly a year since i've owned this one and I haven't gone near the LPG system in all that time. Anyway, the coolant hoses for the Bigas unit that are T'd into the regular hoses looked a bit manky, so i replaced them today with some fresh coolant hose. In the course of bleeding the coolant system and running the engine at revs then i noticed that the LPG Unit started running at high revs ( i had never heard it do anything before) even with the LPG switched off at the dash... I assume that it has some kind of circulation pump in there that was probably full of air, hence the noise it was making. Is there something special I need to do to bleed the circulation system when LPG is fitted? Or it will eventually displace the air when running at full temp and pressure?