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Genuine Acura Legend Fuel Pressure Regulator
Fuel Tank Pressure Regulator- Select Vehicle by Model
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3 Fuel Pressure Regulators found
Acura Legend Fuel Pressure Regulator
The Acura Legend Fuel Pressure Regulator maintains injection pressure so that the V6 runs smoothly. Mounted on the fuel rail, the Fuel Pressure Regulator is based on a spring-loaded diaphragm, engine vacuum port, and return line, which allows excess fuel to loop back in idle conditions but clamps fuel flow when the throttle is opened to increase pressure for acceleration. Throughout first and second generation Legend production, the brand remained with this vacuum-referenced Fuel Pressure Regulator, and owners find the same core unit rather than separate electronic or returnless versions, the primary difference being minor internal spring rates. This simplicity benefits both Acura variants of the Legend, sedan and coupe. Should the valve stick shut, the Acura engine gets too much fuel and runs rich, while a broken spring or leak drops the pressure and produces a lean mix. Quick checks are to unplug the vacuum hose, as a healthy Fuel Pressure Regulator will cause an immediate pressure jump, and pinching the return line to check if pressure increases confirms if the pump or the regulator failed. Dependable pressure regulation from the Fuel Pressure Regulator maintains power, mileage, and emissions on all Acura Legends.
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Acura Legend Fuel Pressure Regulator Parts Questions & Experts Answers
- Q: How Does the Fuel Pressure Regulator Maintain Constant Fuel Pressure to the Injection System on an Acura Legend?A:The fuel pressure regulator maintains constant fuel pressure to the injection system, and when the difference between the fuel pressure and the manifold pressure exceeds 36 psi, the diaphragm in the Fuel Pump is pushed up, allowing excess fuel to return to the Fuel Tank through the fuel return line. On Legend models, a pressure regulator cut-off valve controls the amount of vacuum to the pressure regulator. For vacuum checks on Legend models, inspect the fuel system for pinched or broken vacuum hoses and fuel lines, disconnect the vacuum line from the pressure regulator, and connect a vacuum gauge to the hose. Ensure the coolant temperature is below 221 degrees F before starting the engine and checking for vacuum; there should be vacuum present. If there is no vacuum, check the pressure regulator solenoid valve. After warming the engine above 221 degrees F, check again for vacuum; there should be none. If vacuum is present, check the pressure regulator solenoid valve again. If all pressure checks are correct, replace the fuel pressure regulator. For pressure checks, inspect the fuel system for issues, connect a fuel pressure gauge, and verify that fuel pressure rises after detaching the vacuum hose from the regulator. If it does not rise, pinch the fuel return line to see if pressure increases, indicating a need to replace the fuel pressure regulator. For solenoid valve checks on Legend models, ensure the coolant temperature exceeds 221 degrees F or the intake air temperature exceeds 176 degrees F, which will close off vacuum to the pressure regulator. Measure voltage at the 6P connector; if there is no voltage, repair the open circuit in the BLK/YEL wire. If there are no obvious open circuits, take the vehicle to a dealership for diagnosis. For further testing, start the engine, disconnect the appropriate vacuum hose, and check for vacuum. If there is no vacuum, inspect for blockage. Measure voltage at the 6P connector again; if there is voltage, check for a short in the light green wire. For replacement, detach the cable from the negative battery terminal, relieve the system fuel pressure, detach the vacuum and fuel return hoses from the regulator, remove the retaining bolts, and detach the regulator. Installation is the reverse of removal, ensuring to use a new O-ring and applying clean engine oil to it before installation to prevent damage.
