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It's not recommended to run the engine with that amount of gasoline intermixed with the fuel. Gasoline is thinner and has a higher volitility than diesel fuel and is also not capable of lubricating internal fuel system components the way diesel fuel is designed to. This can cause damage to the fuel injectors and the exhaust system, which runs in to thousands of dollars to repair. The best option is to have the vehicle towed, have the fuel tank drained out and filled with clean diesel fuel. If the engine has been started, replace the fuel filters as well.