Fuel Pressure Regulator Test

The purpose of fuel system is to deliver fuel to the engine right in time and in a right amount. Properly-working fuel system helps your vehicle 's engine to run like a clockwork. But when something goes wrong with fuel system, hassle-free driving is no longer what you can count on. Recognizing symptoms of bad fuel system timely will help you prevent major car issues that require expensive service.

One of the most common fuel system issues is a bad fuel pressure. If you experience difficulties starting your car or engine's performance has decreased, if your car suddenly stalls while driving, it's time to test your fuel pressure regulator. So don't postpone your visit to mechanic to perform diagnosis. Also, if your vehicle is equipped with fuel system test port, you can do it with your own hands.

How to Check Fuel Pressure Regulator

To start the test turn off your engine!

1. Fuel system test port is located on vehicle's fuel rail. If you're not sure where to find it, consult your vehicle's owner's manual.

2. After locating fuel system test port remove its cap by twisting it counterclockwise. Screw the end of fuel pressure gauge's hose onto test port clockwise.

3. Turn on the engine and check the pressure gauge. Normal values it should read are 45 to 55 psi for standard fuel injection systems and 14 to 18 psi for throttle body injection systems. You can find proper fuel pressure values for your specific vehicle in owner's manual. If pressure gauge reads more than 5 psi off your vehicle's perfect fuel pressure, take your car to the mechanic as soon as possible.

4. Turn off the engine and find a vacuum line that is attached to the fuel pressure regulator. Remove it from the fuel pressure regulator and check if there is a fuel inside the line. Normally, there shouldn't be any wetness inside the vacuum line.

5. Reattach the line to the pressure regulator and start the engine. Then remove the vacuum line again and check what pressure gauge reads. Under normal conditions its values should increase by 50 to 10 psi. If the gauge values remains the same, the fuel pressure regulator requires replacement.

If fuel pressure regulator test reveals faulty fuel pressure regulator, make sure that you choose high-quality and durable replacement. We recommend you to check out Aeromotive fuel components. Aeromotive is an industry-leading manufacturer of top-notch fuel system parts, that are designed to last long regardless of your driving style.