Fuel doesn't easily go down the line and reach its destination on time. It needs all the help it can get from the fuel pressure regulator, which gives it the much-needed push by maintaining the right amount of pressure. Through this fuel system component, fuel can travel all the way through the fuel lines and into the engine cylinders, where it is burned and mixed with air.
Trouble with your car's fuel system may start with fluctuations in pressure. This affects the engine in a lot of ways. When fuel pressure is too high, the engine may run rich, which simply equates to wasted fuel. Not only that, you also push the emissions to new heights, which is bad for the environment and for your car. Soon enough, you'll find yourself complaining about misfires and your engine's rough performance. The car may flood with fuel, and the fuel lines may be clogged. Low pressure also results in lean mixture, wherein there's less fuel mixed with air. Cranking up the engine can be very frustrating. The engine may hesitate, misfire, and halt. With all these troubles in mind, you'd better make sure that your car fuel pressure regulator is accurate and in great shape to perform a very crucial job.
Now, you may think that all pressure regulators are the same. But with different fuel systems used and vehicle loading capacities, fuel pressure ranges do vary. Like other fuel system parts, the regulator should be calibrated to match your car's specifications. It should keep constant pressure within the fuel lines under different engine load conditions. Although fuel pressure regulators are usually a tough nut to crack, it may also fail because of leaks, faulty connection, or age. When they do, your first clue can be that flashing "Check Engine Light." Black smoke, that noise in the fuel pump, fouled spark plugs, and the noticeable drop in fuel mileage also tell you that the regulator is shot.
If there are any irregularity on your car fuel pressure regulator, make sure you have it replaced. A direct-fit OEM replacement will do. To set up your replacement pressure regulator, start by opening the fuel cap. Then, remove the relay from the engine fuse box and let it run to stall so that you can relieve fuel pressure. Afterwards, disconnect the negative battery cable, lines, and connectors going to your stock regulator. If your stock regulator is mounted, just unbolt it to remove. However, if it's a part of the pump module, remove the upper and lower sections to disconnect. Now, you're ready to install your replacement. Just lube the new O-ring and connect the new regulator, and you're done!
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