Have Toyota Questions? Ask a Mechanic for Answers ASAP
Hello, thanks for posting
Did you attempt to start it after realizing it was diesel?
To answer your question:
The best way to drain the tank and get all the diesel out is to tow it to the Toyota dealer, they can connect their diagnostic computer to the access port and activate the fuel pump and pump the fuel out through a disconnected line at the fuel rail into a container, if an attempt was made to start it then some of the diesel was pumped into the fuel rail on the engine, this is not a problem, they can open the line and pump the fuel out of the lines and the fuel rail.
diesel fuel is still somewhat combustible in a gas engine so a small amount won't hurt anything and will burn out shortly, it may also trigger a check engine or hybrid system warning light which should be able to be cleared using the diagnostic computer.