I have had two holley 600's (80457s) start leaking on my 327 after less than a year of usage. I have a fuel filter on it (glass version---mr. gasket I think) and have yet to see any trash in it. One of them started leaking out of just about every gasket on it at once----it had been doing fine until then. I shelved it, as it was out of warranty by about a month, and bought a new one thinking I just got a lemon. Today, after only 3 months of service, the new one started leaking also. It was still under warranty and I upgraded to a 670 holley hoping no more problems. The salesman said he thought I was getting rust or trash into the floats. I came home and pull the bowls on both sides of the one I shelved and they look pretty clean---just a dab of dusty residue----and I mean a dab---still shiny in the bowls. Any ideas or is this just common with some holleys? One other thing. The car does sit sometimes for maybe 4 weeks without driving. I would not think that short of period of inactivity would be a problem, but I am grasping for straws at this point. Thanks