Fuel Pressure Regulator in Lexus ES350 automobile is part and parcel of the EFI system by regulating the fuel pressure achieved within the car. It is fitted on the fuel rail and employs a spring as well as the diaphragm control to modulate fuel delivery according to the requirements of the engine. When the engine is lightly loaded, as during idling, vacuum is high, allowing fuel return; when the throttle is opened, vacuum is low, and only enough fuel return is permitted to maintain pressure sufficient for delivery. There have been different models of the Fuel Pressure Regulators that have been used in the Lexus ES350, the adjustable Fuel Pressure Regulators famed for handling modified fuel systems included. OEM regulators are normally non-adjustable, this tends to hamper performance if large injectors or high volume pumps are fitted. Updated regulators can be made from billet aluminium and come in a wide variety of designs to allow adjustment to accommodate many fuel setups.
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