After a transmission problem kept us from operating the engine for several months, we found that the fuel system was contaminated with I don't know exactly what. We flushed the line, took the fuel system apart, and were then replacing both the primary and secondary filters. At this (what we hoped to be) last step, we are stuck - the connection from the new primary filter to the metal fuel line needs some kind of "pressure fitting?" that we can't find. Tried the diesel engine dealer that we had been working with for all of the other parts, tried a suggestion to visit a NAPA parts dealer and talked to other boat owners but to no avail. I am now going into a second season without an engine that runs. Has anyone been through this before or does anyone know a professional that could solve the problem? I would appreciate your help. Thanks.