For every action-there is a reaction-(newton's 3rd Law of forced Pairs), meaning-who's to say that between the time the fuel filter was purchased and now, that something has clogged it up. Pinch the lines between the fuel filter and check to make sure the filter doesn't have any foreign matter which brings me to the question of what fuel grade are you putting in the tank? (you never know with regular grade) if that's what you're going with and with prices these day's all I can say is DAMN!!!! This is what I've done to prevent stuff like this from occurring. (1st) Take a rubber O-ring of some kind and make sure it will fit really snug around the gas tank neck. (2nd) Find the smallest screen possible and run it in the inside of the neck--I'm talking a screen that wouldn't allow a micro-organism through, but you'll have to slow your pour at the pump. Goodluck