GA SMT DECLARED MINIMUM FUEL AFTER FAILING TO COMPLETE 2 ILS APCHS. APCH CTLR GAVE AN ASR APCH.

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OWNER PLT HAD BOUGHT THE SMT EARLIER IN THE WK. AS A SALESMAN I WENT ALONG ON TRIP WHILE HE BECAME COMFORTABLE WITH THE ACFT. TRIP WAS FROM DAL-CLT. THE WINDS WERE ALLOWING THE PLANNED FLT W/O STOPPING FOR FUEL PLUS 1 HR; 10 MINS RESERVE. AT CLT DUE TO DEVIATIONS ENRTE FOR WX; WE ELECTED TO LAND IN GSP FOR FUEL. ATIS CALLED 1500' OVCST AND 2 OR 3 MI. THE OWNER/PLT WAS FLYING; I WAS ON THE RADIO. WE HAD 50 MINS TO 1 HR FUEL ON BOARD. DUE TO A HIGH WIND ALOFT OR THE PLT SLOWLY RESPONDING TO THE LOC NEEDLE WE CROSSED THE OM WITH THE LOC NEEDLE FAR RIGHT. I ASKED FOR ANOTHER VECTOR AROUND. WE INTERCEPTED THE G/S AT THE OM BUT THE LOC WAS STILL WAY OFF THE SIDE (NOT PEGGED). I TOLD THE PLT I WOULD ATTEMPT FROM MY SEAT TO REINTERCEPT FOR HIM. WITH THE PARALLAX VIEW OF THE HSI AND COULD NOT SEE THE AIRSPD FROM THE RIGHT SEAT; I WAS NOT ABLE TO INTERCEPT. I GAVE THE CONTROLS BACK TO THE PLT AND CALLED MISSED APCH. I SHOULD HAVE ENGAGED THE AUTOPLT AND SWAPPED SEATS. WE DECLARED MINIMUM FUEL AND WERE THEN CHANGED TO A DIFFERENT CTLR FOR A SURVEILLANCE APCH TO THE ARPT FROM OPP DIRECTION. THE PLT WAS SLOW TO RESPOND TO THE HDG AND ALT DIRECTION BUT WAS ABLE TO END UP OVER THE CENTER OF ARPT IN THE CLR. I TOOK THE CONTROLS AND CIRCLED THE ARPT WITH THE PLT CALLING MY AIRSPD AND LANDED. ON ROLLOUT I ASKED FOR THE WX AND WAS TOLD 300' OVCST AND 1 OR 2 MI. WITH THE FRONT PASSING THROUGH AS QUICK AS IT DID I SHOULD HAVE TOLD THE PLT TO LAND EARLIER FOR FUEL OR TAKEN THE LEFT SEAT AFTER THE FIRST MISSED APCH. A LESSON WELL LEARNED.