I was reading that there is a major power loss if diesel fuel reaches 100Deg.
Where were you reading that?
If you want to get down to basics, it doesn't make any power at all until it reaches over 400*F.
The density of fuel decreases with increasing temperature so if the volume remains the same, the number of BTUs available in a gallon (for instance) at 100 degrees is less than it is at the standard 60 degrees.
The amount of energy per unit of weight remains the same, it just takes more volume of hot fuel to provide the same weight.
The engine only knows if it is getting enough weight of fuel to maintain the rpm set by the governor. If the fuel is hot, it will tell the injector pump to put in a larger volume of fuel to supply the weight it needs to maintain rpm.
The only way there could be a power loss is if the engine was running up against the governor fuel stop (not speed stop) and the fuel temperature increased.
By the time your fuel reaches the injector nozzle it is far above 100 degrees but the fuel system compensates so that you never even know the difference.
-- Edited by RickB on Friday 23rd of December 2011 10:27:41 AM