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- Some returnless fuel pressure systems use a fuel pump driver module or fuel pump control unit. This is a pulse width modulated signal that is sent to the fuel pump from the fuel pump driver module and engine computer to control the speed of the fuel pump which in turn will control the fuel pressure. The higher the pulse width signal, the higher the fuel pressure.
- Unlike a standard or “dead-head” carburetor regulator, which controls pressure between itself and the carburetor by stopping flow, the bypass regulator controls pressure between itself and the pump by bypassing flow. T he optimum EFI regulator location is after the fuel rail (s) when possible . All pump flow, minus engine consumption, must always run to the regulator, wherever it is.
- Standard® offers direct-fit OE replacements for faulty ESIMs that are manufactured with premium components to ensure top performance and reliability.