Jerry... the thing you need to remember with LEL is that we're talking about vapors. The vapor will explode just as easily. This is NOT to say that diesel will vaporize as easily tho. With gasoline a small amount of liquid fuel will quickly form a large amount of vapor that is explosive. The same amount of diesel may require a lot more time/heat to form that same volume of vapor to enter the explosive range. The trick is.... who really wants to guess at when that amount of diesel will reach the explosive range? With gasoline you generally assume it. With diesel... most people don't... but if you're dealing with a contained atmosphere such as a tank... the potential is always there.
Venting either tank remains as simple as running a large flow of air through the tank. Applying air does two things. It disturbs layering in the tanks so that the vapors are fully mixed and the absolute volume of air going in will supply an air change. As always, the solution to polution is dilution. If you lean the mixture out, it's not going to blow. This is probably not something that most people know.... but anyone who has done any amount of fire training, particularly with regards to gas monitors and ventilation.... should know this.
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