The Fuel Pressure Regulator in Toyota Avalon vehicles should be maintained with respect to control of fuel pressure inside the electronic fuel injection system. It is usually incorporated on the fuel rail, and it is usually operational with the aid of a spring and diaphragm arrangement that controls fuel flow on the basis of vacuum formed in the engine compartment. At idle, the regulator lets fuel flow back to the tank; at higher throtle, vacuum decreases and only enough fuel returns to the tank to provide pressure. In the past or present models of Avalon, several types of Fuel Pressure Regulators have been employed, including varieties that are adjustable to accommodate fuel system modifications. OEM regulators are usually fixed which becomes a disadvantage particularly when large injectors or high volume pumps are fitted. Newer types of regulators, which are normally produced from billet aluminum, allow the fine-tuning of A/F ratios and thus should be suitable for street as well as high-performance racing applications.
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