Caravan Gas?

(Refers U.K ) First it's a gas fitters job who is certified to work on and test LPG equipment, he'll have the right test equipment and will give a pass certificate, or fail report.
Have you checked the appliances gas control master knobs are fully on including the gas cylinder /Bottle.
Also check the condition of the hose from cylinder to it's conncection point on small bore copper tubing.
If there is any sign of the rubber tube cracking change it ensure you get the right type of hose, from a bottle gas supplier or your nearest caravan spares shop.
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www.calor.co.uk has info on gas and regulators and have free downloads.

Bob
October 2010