FUEL PUMP SOMETIMES STOP WORKING INTERMITTENTLY, WHICH COULD LEAD TO A SUDDEN STALL OR HESITATION WHILE DRIVING. THE PROBLEM INCREASES THE RISK OF A CRASH, ESPECIALLY WHEN THE MY SIENNA VAN IS TRAVELING AT A HIGH SPEED. WHEN FUEL PUMP FAILS, I NOTICE THAT THE VEHICLE'S ENGINE STARTS RUNNING ROUGH AND THAT WARNING LIGHTS MAY APPEAR ON THE DASHBOARD. THE ENGINE MIGHT NOT RESTART IF IT STALLS. *TR