A PVT PLT ON A PLEASURE FLT EXPERIENCED AN ENG FAILURE DUE TO FUEL STARVATION ON SHORT FINAL AND LANDED SHORT OF THE RWY.

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I TOOK A PAX ON A PLEASURE/SIGHTSEEING TRIP. THIS PAX HAD NEVER FLOWN IN A SMALL PLANE BEFORE. I SPENT TOO MUCH OF MY ATTN EXPLAINING AERODYNAMICS AND NAV TO MY PAX; AND NOT ENOUGH ATTN ON FLYING THE ACFT. I FAILED TO SWITCH TANKS DURING THE FLT AND EXPERIENCED FUEL EXHAUSTION IN THE L TANK ON SHORT FINAL. CONTRIBUTING FACTORS INCLUDE THAT I AM USED TO FLYING A SIMILAR PLANE WITH A SMALLER ENG; SO I CAN USUALLY FLY SIGNIFICANTLY LONGER ON ONE TANK THAN THE 1.8 HRS THAT I FLEW PRIOR TO EXHAUSTION ON THIS FLT. UPON LOSING PWR; I REQUESTED A SWITCH TO RWY 28R; WHICH HAS AN EXTENSION WHICH I HOPED TO GLIDE TO. I ALIGNED ON RWY 28R AND ATTEMPTED TO GLIDE TO THE EXTENSION. I TOUCHED DOWN JUST SHORT OF THE EXTENSION. AFTER A COUPLE OF ROUGH 'BOUNCES' THE PLANE ROLLED ONTO THE EXTENSION. I TAXIED TO THE RUN-UP AREA WHERE I STOPPED AND MET ARPT PERSONNEL. PRIOR TO TOUCHING DOWN; I MANEUVERED TO AVOID ARPT LIGHTING AND PILES OF SOIL. AFTER COASTING TO A STOP IN THE RUN-UP AREA; I REALIZED THAT I HAD RUN OUT OF FUEL IN THE L TANK. THE DAMAGE WAS LIMITED TO A BROKEN WHEEL FAIRING AND A SEVERED BRAKE LINE. PLT AND PAX SUFFERED NO INJURIES. TO AVOID ANYTHING LIKE THIS HAPPENING AGAIN; I WILL USE CHKLISTS FOR EVERY CLB; EVERY DSCNT; EVERY CRUISE; ETC. THE FOLLOWING IS NOT AN EXCUSE; BUT A FACTOR WORTH MENTIONING. I HAVE BEEN PRACTICING FOR AN INST RATING. I BELIEVE THAT I THOUGHT OF THIS FLT AS 'JUST A VFR FLT;' AND THEREFORE WAS COMPLACENT.