After fueling this 2002 Santa Fe, it will not start. Eventually after it does start, the engine will not shut off. It keeps running for about 2-3 hours. This only happens when we add fuel. We have taken it to a mechanic and consulted the dealership.......no one knows!! please help.

 

Have never heard the no shut off problem but as for hard start after fill up common for purge valves . You may also have a saturated charcoal canister. Now as for no shut off I would check to see if you still have ignistion after shutting key off. Start from there.