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Originally Posted by pmh
accumulator is used to keep the mixture at a constant (high) pressure to atomise the liquid
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bingo,
basically it allows you to have the pump and tank in the boot out the way and the accumulator maintains the pump pressure all the way to the front of the car,
regular systems need to have the pump and tank in the engine bay, which makes the options of fuels limited in case of fire, or alternatively require two pumps, one in a surge tank in the engine bay, the other from the boot.
boot mounted tanks allow more fluid, and also allow more freedom in fuels, ie race fuel/methanol/water/mixtures of all the above