2002 GMC Sierra 1500 - Fuel Pressure Regulator

When to Replace a Fuel Pressure Regulator

A fuel pressure regulator is responsible for providing a consistent fuel supply while driving. Located inside the fuel tank or elsewhere on the frame, the fuel pressure regulator monitors and controls the pressure of the fuel being supplied by the fuel pump to the engine's fuel injectors. Without a pressure regulator, the fuel pump can run constantly and over-pressurize the fuel system, leading to performance issues and fuel waste. While the fuel pump supplies a consistent fuel pressure resulting in more fuel than the engine needs, the fuel pressure regulator alters the pressure as needed to ensure the right amount of fuel is reaching the engine in varying driving conditions. Because your vehicle can not run properly without a functioning fuel pressure regulator, regulator failure could result in rough idle, black smoke or unburned fuel in the exhaust, or engine stalling. You may also notice misfires or smell fuel on your spark plugs, dipstick, or when decelerating. This may require not only fuel pressure regulator replacement, but also an oil change if excessive fuel has contaminated the oil supply. Fuel pressure regulators are not typically regular maintenance items but may require routine service as instructed in your vehicle's owners manual. If you notice any fuel system issues, it may be time to inspect or replace the regulator, fuel pump, fuel filter, or fuel injectors, but be sure to complete a thorough diagnosis before beginning your repair. If the fuel pressure regulator is the source of your problem, find the right replacement regulator for your repair at O'Reilly Auto Parts.