I was talking with an old rancher he told me about how a ranch hand screwed up one of his trucks by running reg gas in it(diesel engine) but he said a little diesel in your gas tank will blow the carbon out of your engine.
Well what do you all say and if it does how much should you put in?

 

i'd say don't do it.
gasoline is more of a solvent than diesel, so i think you'll end up with an oily, sooty mess, possibly a clogged cat or fouled o2 sensors. could end up costing you $$$.

if you want to remove carbon buildup, use either mopar combustion chamber cleaner or seafoam.

i filled up my old old chevy about halfway with diesel one time by mistake. duh. filled the second half with gas and ran it out. it ran, didn't foul out, but seemed a little sluggish. it certainly didn't seem to help it any. i think your old rancher is f***ing with you.