Fuel Pressure Regulator
As the name implies, the fuel pressure regulator regulates the pressure of the fuel entering the fuel injectors. Older cars may have a continuous return fuel system, in which the fuel pump extracts more fuel than is needed from the fuel tank. In this system, the fuel pressure regulator returns excess fuel to the fuel tank via excess lines to relieve the amount of fuel pressure. Newer cars will have a return-less fuel system, in which the fuel pressure regulator is mounted directly on the fuel pump and draws the exact amount of fuel needed – meaning no excess fuel needs to be returned to the tank. Both the fuel pressure regulator and the pump may be controlled by a vehicle computer.
Signs of a bad fuel pressure regulator
- Poor fuel economy
- Poor engine performance
- Engine won’t start
- Engine stalls
- Fuel pressure too high or too low
- Fuel leak
- Black smoke coming from exhaust
- Check engine light illuminates
Fuel pressure regulator maintenance
If you notice any of the above signs, get your car checked out by a car care professional as soon as you can. Your technician will perform a test with either a mechanical gauge or a scan device to diagnose the issue with the fuel pressure regulator. A faulty regulator will be replaced with a new one. Depending on the type of vehicle, the fuel pump assembly may need to be replaced as well.
The best way to get maintenance done on your fuel pressure regulator is to book your appointment through CarAdvise. CarAdvise makes car care simple and guarantees that you’ll pay less than retail price on all car maintenance services.« Back to Glossary Index