A C402 ON CLBOUT AT 7000 FT DECLARED AN EMER DUE TO R ENG RUNNING ROUGH. ON FINAL APCH; SHUT DOWN R ENG. CAUSED BY LOSS OF FUEL PRESSURE DUE TO FUEL LINE LEAK.

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ON CLBOUT; OUT OF ZZZ; R ENG BEGAN RUNNING ROUGH WITH CORRESPONDING LOW FUEL FLOW. PULLED MIXTURE BACK TO CONFIRM IT WAS A FUEL PROB AND ENG RAN WORSE. TURNED R FUEL PUMP TO HIGH AND ENG CONTINUED TO RUN. INFORMED APCH I WANTED TO RETURN TO ZZZ. APCH CLRED ME TO ZZZ VIA RADAR VECTORS AND ASKED IF I REQUIRED ASSISTANCE. I SAID NOT YET; BUT LATER ASKED IF THEY COULD HAVE THE FIRE TRUCK STAND BY. I THEN CALLED ZZZ UNICOM AND ASKED FOR THE TRUCK TO STAND BY AND INFORMED CFR I WAS HAVING ENG TROUBLE. I PICKED UP THE ARPT VISUALLY AND WAS CLRED FOR THE VISUAL APCH. UPON REDUCING MY PWR THE R ENG BEGAN RUNNING VERY POORLY; WITH CORRESPONDING DROP IN MANIFOLD PRESSURE. I KEPT ENG RUNNING TILL I WAS ON FINAL FOR RWY 27L; THEN AS A PRECAUTION I SHUT DOWN THE R ENG AND FEATHERED THE R PROP ON FINAL APCH. LANDED SAFELY WITHOUT INCIDENT ON L ENG. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAUSE OF THE R ENG RUNNING ROUGH AND THE LOW FUEL PRESSURE INDICATION WAS CAUSED BY AN ENG FUEL FEED LINE CONNECTOR LOCATED IN THE ENG NACELLE THAT CAME LOOSE. THE CONNECTOR WAS STILL CONNECTED BUT WAS VERY LOOSE AND LEAKED HEAVILY.