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Find a beater to toss the gas/diesel mix into. A few years ago while working on a job a couple hours from home I brought a tank of diesel fuel and one of my guys accidentaly filled the 5.5 Honda air compressor with it. Half the tank was used when I ran down the ladder. I tossed the compressor upside down ran the diesel out of it and filled it with gas and it fired right up. The motor still runs but the pump failed a year or so after.
If it were my truck I'd drop the tank as previously mentioned and let it be a $84 lesson learned. One of my mechanic buddy's had to do the fuel tank empty job after being filled with gas and he charged around $150 to make the problem go away.
Based on Diesel Power magazine, it is not ideal to have gasoline in diesel engines, but as much as 30% of fuel can be gasoline. In your case you have too much, and you will need to siphon like the rest on the guys said. I accidentally added gasoline to my diesel tractor and had to siphon it out.