found this information online. Hope they dont mind me passing it on. the fuel filter #0149-2629 that is just below the carburator start to leak fuel at the seams. I have heard of many others having this same problem. The 5500 has two fuel filters, one just before the fuel pump under the generater and the one just below the Carb. Onan is evidently aware of this problem because they now have a different filter for this model and recommends that you put the new filter before the fuel pump and do away with the filter under the Carb. To do that they sell an adapter that you screw into the carb. where you took the old filter off. It has a barbed fitting where you then slip the gas hose over it and tighten the clamp. The adapter is part number A026E529. So get a new filter part number 0149-2341-01 and put it before the fuel pump and a adapter part number A026E529 and put it under the CARB and hook the hose to it and you will be good to go. There is supposed to be a Onan product bulletin #17 about this but I can't find it anywhere. Should have been a recall in my opinion as a fire hazard, but I have not seen any recall. Here is the web site that shows both parts , the adapter and the new filter. The adapter is long enough so that the existing fuel hose will reach it. Onan Adapter A026E529 I hope those of you who have this model HGJAB 901C Spec C genset that you take a look and see if you still have that questionable filter right under the carburator and if you do I would suggest that you change it out with the adapter and a new filter before the fuel pump..