How to Troubleshoot High Rail Pressure in Electronic Fuel Injection Diesel Vehicles?

[OVanessa]

Check the fuel discharge during ignition. If no fuel is discharged, consider a potential fuel pump malfunction. If fuel is discharged, use a high-pressure tool to measure the fuel discharge pressure. Inspect whether the fuel tank is clean and free of foreign objects, and check if the vent hole is blocked. Examine the entire fuel line for any bends and ensure all connections are sealed and airtight. Loosen the fuel pump return line, start the engine, and observe if the issue resolves. If the issue disappears, it indicates a blocked fuel pump return line. If the issue persists, inspect the high-pressure fuel pump itself.