What it is (geek talk) - All fuel injected vehicles are equipped with fuel pumps that run more fuel than is required in the fuel rail that feeds the injectors. As a result, most vehicles have OEM fuel ...
In the early days of direct injection, fuel was fed (at low pressure/5 to 20 psi) from a fuel pump (or lift pump) to an injection pump, which then ramped up the pressure to 15,000 to 25,000 psi, ...
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