California BAR Smog Technician Practice Exam

Where would a Technician find the Fuel Pressure Regulator in a vehicle equipped with TBI?

Behind the glove box. In the fuel tank. On the floor near the driver's seat. The Fuel Pressure Regulator is located above the throttle body near the injectors.

Correct Answer:

The Fuel Pressure Regulator is located above the throttle body near the injectors.

Explanation:

In a TBI system, the fuel pressure regulator must be placed where it can directly sense the intake vacuum and control the pressure delivered to the injectors. That’s why the regulator is mounted on or very near the throttle body, typically above it near the injectors. This 치치 allows the regulator to use a vacuum line to the intake manifold, so it can adjust fuel pressure as engine load and vacuum change, returning any excess fuel back to the tank to keep the rail pressure steady. Other spots like behind the glove box, in the fuel tank, or on the floor near the driver’s seat aren’t involved in regulating the pressure that feeds the throttle body injector, so they aren’t correct for a TBI setup.

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