I just ordered a OEM replacement for a leaky petcock. However, the main fuel tube doesn't fit into the tank. I don't know if the reserve tube will fit. The new petcock has a brass tube where as the old has a plastic tube. I was thinking I could just exchange the tube but the new one seems to be pressed in the valve. The part that doesn't is the base of the filter that attaches to the brass tube. 95% of the filter will go inside the tank. Did I get the wrong part even the part number matches the online microflim? I would hate to re-order the same thing. Are there any other options?