4-Bar Fuel Injection Pressure Regulator

The Bosch Fuel Injection Pressure Regulator is engineered to maintain a consistent fuel pressure within the range of 25 to 60 lbs, regardless of engine conditions like idling or acceleration. This precise regulation is vital for ensuring the fuel injectors deliver the optimal amount of fuel, creating an ideal air-fuel mixture for efficient combustion and peak engine performance. Mounted typically on the fuel rail or integrated into the fuel pump assembly, this regulator works by returning excess fuel to the tank. This function is crucial for improving overall engine performance, enhancing fuel efficiency, and helping to meet emissions standards. Symptoms of a faulty fuel pressure regulator can manifest as poor engine performance, rough acceleration, hard starting, engine misfires, increased fuel consumption, rough idling, and illuminated check engine lights. This Bosch fuel pressure regulator is designed as an OE-quality replacement part. It fits a wide range of Audi and Volkswagen models, including various configurations of the Audi 100, 100 Quattro, S4, and other related vehicles from the 1990s through the early 2000s, often specifying engine sizes such as 2.8L V6, 2.2L L5, and 2.7L V6. Specific fitment details include models like the 1992-1994 Audi 100 (FWD/AWD, Sedan/Wagon, Automatic/Manual, 2.8L V6 AAH Gas), 1992-1994 Audi 100 Quattro (AWD, Sedan/Wagon, Automatic/Manual, 2.8L V6 AAH Gas), and various Audi S4 models from 1992 to 2008, encompassing engine sizes from 2.2L L5 to 4.2L V8. Always verify fitment for your specific vehicle's year, engine, and drivetrain configuration.