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Thanks Bob_n_Cincy, I found out that that I received a badly machined fitting it was slightly smaller then the other 5/16th fitting. I found another one and it fit correctly!Redfogo,
The pressure line coming out of a Subaru pump assembly and the fuel connections at the engine use a 5/16 OD tube that has a ridge in the metal about 3/4" from the end.
See this picture.
fuelfitting.jpg
Here is a picture of the RUS-644113 fitting.
russel.jpg
The body of the part has an O ring in it. Slide it over the end of the tube as far as possible.
Then put the slotted bushing on the tube and screw it into the body of the fitting.
The ridge of the tube will be trapped in the fitting.
Let me know if this all makes sense.
Bob