The basic difference between direct injection (DI) and the port-fuel injection (PFI) systems we've become familiar with since the mid-1980s is that PFI sprays fuel into the intake manifold (behind ...
Unlike with carburetors (which use about 7 psi), fuel injection relies on much higher fuel pressure (usually between 38-50 psi). The elevated pressure helps atomize the fuel as it flows through the ...
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