Mercedes-Benz fuel pressure regulator replacement costs & repairs

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Does My Mercedes-Benz Fuel Pressure Regulator Need Replacing?

An internal combustion engine (ICE) needs a constant supply of fuel to stay running, and the fuel pressure regulator keeps the fuel pressure in the ‘sweet spot’ whenever your engine is running.

For most Mercedes-Benz's, the fuel pressure regulator will perform perfectly throughout the car’s whole life. However, unexpected issues can pop up that require fuel pressure regulator replacement, but typically on cars with at least 100,000 to 150,000km on the odometer.

When a fuel pressure regulator fails, it’s almost always suddenly. You may notice fuel leaking at the fuel rail, excessive black smoke from the exhaust, engine running rough or not at all or the check engine light illuminates.

The fuel pressure regulator is located near the fuel rail, either attached directly to one end or mounted on the firewall a very short distance away. Even if there are two fuel rails like on a V6 or V8 engine, there’s usually just one fuel pressure regulator to serve both.

The fuel pressure regulator is constructed of a metal housing fitted securely to the fuel rail. The fuel pressure regulator restricts the flow of fuel exiting through the fuel rail, then releases unused gas into the fuel return line.

The diaphragm in the fuel pressure regulator can become stuck or damaged, either building too much pressure at the fuel line or not enough to keep the Mercedes-Benz's engine running well.

The only solution is fuel pressure regulator replacement. Some engines require several hours of disassembly to access the fuel pressure regulator, inflating the cost of repair significantly.

Mercedes-Benz fuel pressure regulator replacement should be thoroughly diagnosed as problems like faulty fuel injectors or a failing fuel pump that can mimic fuel pressure regulator failure and that’s a service AutoGuru can help you with!