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Direct injection is where the pump has 4 direct individual outputs to each corresponding injector ...
Common rail pump has only one output.
It pumps fuel into a common chamber ( kind of like a tank on a air compressor) " rail" and then from there , there are 4 individual lines all at rail pressure to injectors. Injectors are then controlled and cracked electronically.
Crd pumps are way simpler and therefore a lot cheaper too than Di pumps.
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