I am new here I have a 3500 limited dually 2020 truck, just got the notice like a week ago, took the truck and hauled around 10K, at the top of pass the truck started acting real weird, almost like in wrong gear, was real loud knocking, I turned off, tried to start and would not start, went riding for a few hours, came back and it started but def wasn't running right, at high speed it seemed normal, when i slowed at idle it just wasn't working right, first hill coming back the check engine light came on, made it home, now won't start, only has 12K miles, dealer said the can get in on the 29th, does this sound like the fuel pump problem?