New Holland TC30 Problems

I have a New Holland TC30 tractor. I was low on fuel when I went to fill it up. By mistake (what a fool I am!), I put about a quart of fuel in the tank

I have a new Holland tc30 HST.Last year I overridden the seat safety switch.Now he sometimes acts like he’s connected.Engine runs but shuts down

Yesterday I started my TC30 or at least I tried. I bought it new and it is two months old. It started well at first and then I let it warm up for a couple of minutes.