THE PLT OF A C182 MADE AN OFF ARPT LNDG WHEN THE ACFT RAN OUT OF FUEL. DURING THE AFTER LNDG INSPECTION SEVERAL FUEL LEAKS WERE DISCOVERED.

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I LEFT LEE'S SUMMIT ARPT AROUND XA00; FLEW S 10-15 MI. CALLED APCH FOR A PRACTICE ILS AT GVW AND WAS GIVEN A HDG OF 210 DEGS. SHORTLY THEREAFTER THE ENG MISFIRED. I TRIED CARB HEAT WITH NO PERMANENT EFFECT. I DECIDED TO MAKE A PRECAUTIONARY LNDG AND DID SO IN AN OPEN FIELD WITHOUT INCIDENT. ENG CONTINUED TO RUN UNTIL MIXTURE CTL WAS PULLED OUT. UPON EXAMINATION OF FUEL CAPS THE L ONE WAS FOUND TO BE LOOSE AND A LOT OF FUEL STAIN WAS FOUND ON THE WING. ALSO SUMP VALVE ON R WING WAS LEAKING A DROP AT A TIME AND HAD BEEN FOR SOME TIME. I BELIEVE THE FUEL STARVATION WAS DUE TO THE LEAKING SUMP VALVE AND LOOSE FUEL CAP. THE ACFT WAS FUELED AFTER PREVIOUS FLT AND STORED IN A LOCKED HANGAR. I HAD THE ARPT BRING OUT SOME FUEL AND PUT 10 GALLONS IN THE L TANK AND 5 GALLONS IN THE R TANK. I THEN FLEW BACK TO ARPT ON THE L TANK WITHOUT INCIDENT. MY PAX WHO ALSO IS A FLT INSTRUCTOR ASSISTED ME IN THE OFF ARPT LNDG. SUPPLEMENTAL INFO FROM ACN 392105: THOUGH I WAS NOT THE PIC; I AM A FLT INSTRUCTOR; AND WAS ASKED TO GO ALONG AS A SAFETY PLT WITH THE PLT. AFTER SOME 30-45 MINS OF FLT; THE ENG MISFIRED. AFTER AN ATTEMPT TO KEEP THE ENG RUNNING; THE PLT SAID 'I THINK WE ARE OUT OF FUEL.' AT THIS TIME A PRECAUTIONARY LNDG WAS MADE WHILE WE STILL HAD SOME PWR. THE ENG WAS STOPPED BY CLOSING THE MIXTURE CTL. I GOT OUT OF THE ACFT AND CHKED THE FUEL CAPS. I FOUND THE R ONE WAS LOOSE AND THE TOP OF THE WING WAS COVERED WITH FUEL. I CALLED THE ARPT AND HAD SOME FUEL BROUGHT TO US. THE ACFT HAD A LEAKING FUEL DRAIN ON THE R TANK FOR SOME TIME; ONLY A SLOW DRIP. THIS; ALONG WITH THE LOOSE FUEL CAP CAUSED THE FUEL LOSS.