EMER OFF ARPT LNDG TKOF (A TOUCH AND GO) WAS MADE ON A DESERT ROAD AFTER PWR LOST TO BOTH ENGS ON A C402 BUSINESS LINER. ACFT WAS ON A FERRY FLT TO NORTH LAS VEGAS. POSTFLT INSPECTION FOUND WATER IN THE FUEL. FUEL CONTAMINATION. ACFT DAMAGED.

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ON THE WAY TO PEACH SPRINGS VOR FROM THE GRAND CANYON; I WAS APPROX 500-1000 FT AGL FAMILIARIZING MYSELF WITH THE TERRAIN FOR THE PURPOSE OF WX DEVS THAT WE SOMETIMES ENCOUNTER THAT PROHIBIT US FROM GOING OUR NORMAL RTES. I WAS GOING BACK EMPTY FROM THE GRAND CANYON TO NORTH LAS VEGAS WHICH I HAD NOT DONE FOR A WHILE AND THE WX SEEMED TO BE DETERIORATING WHERE IT MIGHT BECOME A FACTOR IN THE NEAR FUTURE. I BELIEVE I WAS STILL ABOUT 15 MI AWAY FROM PEACH SPRINGS WHEN THE L ENG BEGAN TO PULSE OR SURGE. I IMMEDIATELY REACTED BY PUSHING UP THE MIXTURES; PROPS; AND THROTTLES AND MADE SURE THE LNDG GEAR AND FLAPS WERE UP. I BEGAN A SMALL CLB UP KNOWING I COULD CLB ON 1 ENG BECAUSE OF THE LACK OF WT THE PLANE WAS CARRYING. I WANTED TO TROUBLESHOOT THE PROB AND MAKE SURE I COULDN'T GET IT RUNNING AGAIN BEFORE I FEATHERED THE ENG. THE SECOND ENG STARTED DOING THE SAME THING MAYBE 10 SECONDS INTO THE CLB. BOTH ENGS WERE NOW SURGING; SO I TURNED FOR A NARROW ROAD AND PREPARED FOR AN EMER LNDG. I QUICKLY CHKED THAT THE FUEL SELECTORS WERE ON THE MAINS AND THE FUEL QUANTITY GAUGES WERE INDICATING I HAD FUEL AND THAT THE MAGNETOS WERE ON. I NOTICED THE FUEL FLOW INDICATORS WERE JUMPING SO I CAUTIOUSLY PUT THE FUEL PUMPS ON HIGH KNOWING THAT THEY COULD CAUSE THE ENG TO DIE AS WELL. THERE WAS NO IMMEDIATE CHANGE SO I TURNED THEM BACK OFF. I PUT THE GEAR DOWN AND AROUND THE TIME OF THE FLARE THE ENGS BOTH CAME ALIVE AGAIN. I TOUCHED DOWN MOMENTARILY BUT DECIDED TO CLB OUT BECAUSE OF THE CONDITION OF THE ROAD; THE WIDTH OF THE ROAD; AND THE TREES AND BUSHES ON BOTH SIDES OF THE ROAD. I DO REMEMBER HEARING A THUD BUT I AM NOT EXACTLY SURE WHEN I HIT THE TREES OR BUSHES. ABOUT A 1000 FT INTO THE CLB I CALLED AND SAID I HAD A PROB ON COMPANY FREQ ON 123.45. ON THE WAY UP TO 8500 FT THE ENGS CONTINUED TO SURGE BRIEFLY AND AROUND THIS TIME I NOTICED THE WINGTIP DAMAGE ON BOTH SIDES. AFTER LEVELING OFF AND THE LAST 20 OR 30 MINS OF THE FLT; I HAD NO PROBS WITH THE ENGS. I FLEW BACK AT 120 KTS HOPING NOT TO CAUSE ANY MORE DAMAGE TO THE WINGS. AT EAST POINT I CALLED AND ASKED APCH CTL FOR A PRIORITY LNDG AND TO REMAIN HIGH UNTIL I WAS AT A SAFE DISTANCE FROM NORTH LAS VEGAS ARPT. NO EMER WAS DECLARED AND I ASKED FOR NO FURTHER SVC. AFTER SAFELY LNDG I PULLED THE PLANE TO THE MAINT HANGAR. AFTER TELLING WHAT HAD HAPPENED; MAINT DRAINED THE FUEL AND FOUND OVER A CUP FULL OF WATER IN THE FUEL.