Have a 2014 Silverado 2500 duramax guys at work put 9 gallons or a 1/4 tank of gas in it and drove it, has 3/4 tank now, it started but it kinda rumbled and shook can I save it,

 

You can only try- remove gas-diesel mix from tank, lines, fuel cooler etc, replace fuel filter and try with fresh diesel.
If it still acts up it sounds like high pressure pump+injectors time. Not sure if this repair does not exceed the value of the vehicle.

Good Luck!

 

The new diesels have catalytic converter and / or def injection.

If this question was posed on our old 12 valve trucks, which have none of that crap, you would simply add a couple gallons of new engine oil to the tank, top off with fresh diesel, and drive it.

I agree with Alpine. Drain the tank, refill with diesel and see what happens.

New emissions parts may or may not require replacement . you might get lucky, and all would be fine.

 

It sounds like mixing gas with diesel can cause damage, but you might still be able to fix it. First, stop driving it to avoid further damage. Have the tank drained and the fuel system flushed as soon as possible. You may also want to check the fuel filter and injectors for any damage. It’s a good idea to take it to a mechanic who has experience with diesel engines to avoid bigger problems.

 

Thanks for your insight into a problem from 5 years ago.
I am guessing the guy has not had his truck parked for 5 years waiting for this brilliant insight…Most of which was given to him years ago, when he needed it.