The wife put about 2 gallons of petrol in the tank realised then filled it to the brim with diesel will i get any problems ,the car seams to be running ok
You may be good to go if it's running OK at this time. If you have more than 2 gallons of gas in the tank I would recommend draining the fuel tank and filling with diesel. I'd top up the tank with diesel again after a couple hundred miles to dilute the gas more.