Most people never think of this. In N. America this last Winter has brought out a ton of weather extremes that aggravate the problem.

Water gets in your fuel by condensation in the air in your fuel tank. Tanks are made to hold a bit of water below where it gets picked up but after a few or more years it can get in the lines. Problems show up with extreme cold weather mostly but if bad enough can confuse diagnosing problems in warmer climate also.

I suggest use of a Water remover a couple times a year or so. I am not a fan of all kinds of additives but this is a real trouble spot if ignored. If your car is running fine and a bit older, put some in (I like to use 1/2 of what the bottle says twice) now and then and have NEVER had a frozen gas line in any vehicle I've ever owned! Make sure the product is labeled for removing water not just gas line anti-freeze. Good Luck and Happy Motoring.
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Tom Greenleaf - MetroWest Boston - USA
http://www.acsource.com/

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http://www.autoacsystems.com/tomgreenleaf/

Tom I agree, using a water remover will really help out in the colder months if someone forgets to refill their gas. Some times in very cold climates the water could causes you a lot of trouble so the $2 dollar investment in the water remover could very well payoff.