I am sure you can fit a fuel water separator to your pump if you are worried about any water. These are pretty cheap..for example:
http://www.google.com/products/cata...4TJBNS20QGv19nDDw&ved=0CJEBEPMCMAM#ps-sellers
http://www.google.com/products/cata...4TJBNS20QGv19nDDw&ved=0CJEBEPMCMAM#ps-sellers