Blocked or Not...
Can you describe your problem in a bit more detail? On my C30 I found that it took forever to fill the tanks -- then I went below and heard the automatic bilge pump running; turned out the vent tube went down into the bilge, below the level of the tank, and was siphoning the tank dry even as I continued to fill it! (no vented loop in the run from tank to bilge). Could you be having a similar problem with the apparent result that the tank appears never to fill?Mike TurnerS/V Amity