Chevrolet Blazer engine running rich due to fuel leak in intake manifold on Chevrolet Blazer

Some Chevrolet Blazer owners report experiencing issues related to a rich-running engine caused by a fuel leak inside the intake manifold, which can lead to hard starting, poor performance, and increased fuel consumption. These problems are often attributed to a leaking fuel pressure regulator or fuel line. To accurately diagnose the source of the leak, the fuel system must be pressurized with the upper intake manifold removed. Symptoms of this condition include excessive exhaust smoke, a check engine light, and significant drops in gas mileage, along with a strong fuel smell. Additionally, a rich-running engine may cause trouble codes like P2178 and P0172, indicating a vacuum leak and decreased fuel efficiency. Owners may also notice carbon deposits on spark plugs and experience slower acceleration and stalling at idle. Prompt attention to these issues is crucial to prevent further damage and maintain optimal performance of the Chevrolet Blazer.