After 40 years of driving gasoline vehicles I purchased my first diesel, a 2015 RAM Ecodiesel. 8 months after ownership I stopped to purchase diesel and got disoriented when the pump would not accept my credit card finally. Finally getting it to work I proceeded to put fuel in but accidentally 0.5 gallons of gas was put in the tank I noticed it was the wrong hose shutting it off immediately. I contacted 3 dealerships about what to do and all said to have the truck towed in and tank pumped. finally one dealership said I could do it myself removing the fuel filter from the back at the tank and cycling the switch on and off to pump the fuel out of the tank. this would have been very acceptable as there was probably less than two gallons of diesel in my tank when I started to fill up. all dealership said do not start the engine even with only half a gallon of gas mixed even with a full tank of diesel. they all recommended pumping it out first. I figured I could do this on the side of the station under a tree and proceeded to find a friend to pull my truck off the station site. After repeated attempts to disengage the transfer case so I could pull my truck off the site I resorted to using the emergency lever on the left side of the steering wheel to put the truck in neutral but in my process of trying to select neutral in the transfer case, unfortunately my foot was on the brake and so the engine started and using/pumping the mixed fuel now into the line. it ran about 5 seconds before I could turn it off. Unfortunately cycling through the switch again it started and ran again now for 3 seconds before I could turn it off. pulling the truck offsite, I dropped the fuel filter and immediately smelled gas in the fuel. Starting the on switch it took 11 "on" cycles to pump about a gallon fuel through the line. in 41 on cycles the tank was pumped empty but I added a half a gallon of diesel to the tank twice and Pumped each half-gallon out to help flush the tank of gas. After the fuel came out smelling like diesel vs gas I installed a new filter and went to the engine and disconnecting the inlet fuel line above the engine and ran the "on" cycle once more to flush the line of gas/diesel fuel mixture. after the third "on" cycle flushing the linen no more gas was detected by smell coming from the line. after adding more diesel to the truck, i started the truck and it ran fine with no engine lights or issues noticed at all. I drove perfectly for 25 miles and then I noticed an engine light came on. I stop the truck read the book manual and it said that was probably due to dirty fuel and if it continues to stay on have the truck serviced. The engine light stayed on for another 40 miles. I started the truck the next morning and there was no engine light and it has not come back on for 3 weeks of driving. Since then all seems to be ok. If you put gas in your diesel I would recommend pumping it and the "on" switch does a good job especially if you have a low volume of fuel in the tank.