Ah, a wonderful thread to return to!
I missed you guys.
As a member of the military, we have thousands of people that are not "The Brightest crayons in the box", and having said that, when you are really tired and the only thing to distinguish the fuel types is a coloured band on the Jerry Can, you can mix up fuel types. It is a common mistake.
Diesel in a Gas engine: Yes, it is unfortunate, as your filters and spark plugs and everything else will be horribly gummed up. The mechanic chastizes you quite soundly, you feel shame and your co-workers never let you forget.
"Hey Ben, remember that time you put diesel in the Commander's Jeep and he had to walk for 10k? That was funny as hell."
Gas in a diesel engine: There is a big problem here. Yes, the above poster is right when they say that there is no spark and diesel engines run on compression. Gas engines run on about 10-12:1 compression, and diesel starts combusting at about 30:1. (Expert mechanics help me out on the numbers here please)
So when the piston starts to compress on the up-stroke, the damned gas starts to combust before it (the piston) reaches the proper height. Then you start to bend really important things like valves, cams, rocker arms, and the piston rods themselves. You have also introduced a fuel with nearly zero lubrication properties (relative to diesel, anyway) and will also burn the piston rings. Did I mention this is happening at about 3 times the fuels normal compression environment? Shit starts to explode, and it is nasty.
While the diesel engine is burning the last bit of natural fuel in its fuel lines and introducing the devil's blend you have unfortunately poured in the tank, there is about 3 seconds when the engine starts to rev at a very high rate and it sounds really cool like a race car and nothing at all like the normal "dang-bang-dang" of our friend diesel. This is the amount of time you have to realize your mistake without frying the WHOLE ENGINE!
This is where you have a really mad mechanic, and the story is not so funny.
"Ben, remember the time when you blew up the Commander's truck, and he made you give him a piggy-back ride until a replacement arrived?"
