AS THE ACFT WAS ON FINAL APCH TO LAND AFTER A BFR FLT, THE ENG LOST POWER DUE TO FUEL STARVATION. DURING A SUBSEQUENT EMERGENCY LANDING, IT COLLIDED WITH TREES SHORT OF THE RWY & WAS DAMAGED. AN INVESTIGATION REVEALED THE ENG LOST POWER WHEN THE RIGHT FUEL TANK EMPTIED & THE LEFT TANK WAS STILL FULL.