change charcoal vapor canister?

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. I'm sorry to hear you're having trouble with your vehicle. In the ML350, a clogged charcoal canister can restrict fuel flow when filling up, leading to issues at the pump. In this case, the canister and fuel tank must be replaced together as an assembly. After installing the new parts, it is recommended that an evaporative emissions system leak test be performed to confirm all hoses and seals are correctly installed. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!