As mentioned, it would be far worse to have gas in a diesel.

Two biggest problems you will face is that it won't run once the diesel gets to the motor.

And diesel fuel is a fuel oil that will ruin the cats, causing it to not pass smog.

Older vehicles without cats, a gallon of diesel mixed in with 20 gallons of gas will actually extend the motors life, as I said previously diesel is a fuel oil.

Drain it and flush the tank with fresh gas.

You'll probably want to take it to a shop, but it is possible to disconnect fuel filter and let the fuel pump empty the tank for you.

Not near as bad as gas in a diesel. Like they said, have it drained.

Call a breakdown service.

Get it recovered to somewhere they can drain the fuel tank

DO NOT START IT.

There is no need to shout at us for you being stupid.

Do not try to start or turn the engine over. You need to complely drain the tank, then fill with gasoline

Tow it to a mechanic and they will drain and clean out the fuel system. Don't try running it that way.

Ugh. Have it towed to a shop, and have them drain the gas tank. It will cost you a few hundred dollars...

You can't. The gas nozzle mechanism is different to prevent that. This is a troll question, which is what I have reported it as.

Have the fuel tank and fuel system drained by a mechanic.

Drain/siphon the fuel tank and replace with gasoline. This is assuming you didn't start the engine after refueling with the wrong fuel..

How did you do that? I thought the nozzle wouldn't fit. Drain the tank and refill it with gasoline.