Here is a hypothetical scenario - lets say your alternator decides to go west in a failure mode that produces 40 volts (yes, there is an overvoltage failure that can produce voltages approach 60 -100 volts). Since you fuel pump will draw the basically the same current (perhaps a bit more with the higher voltage) the power across the fuse (Power = current * Voltage) will jump approx 4-5 fold.  (It is the power rating rather than current that causes a fuse to blow by the way).  You have just blown several fuses - could be critical ones.  Your alternator has died or you have disabled it and you could make it on the battery - but, fuse is blown.  Circuit breaker reset and one of your two redundant circuits (perhaps both) may work again. Just a hypothetical scenario.