1. Fuel Pump and Relay:
* Listen for the pump: With the key in the "on" position (not starting), listen carefully near the fuel tank. You should hear a whirring sound for a few seconds, indicating the pump is running.
* Check the pump relay: If you don't hear the pump, there might be a problem with the relay. Look for a clicking sound when you turn the key to the "on" position. You can test the relay with a multimeter or swap it with a known good one.
* Check the fuel pump fuse: This is a safety precaution. Look for a blown fuse in the fuse box.
2. Fuel Lines and Filter:
* Visual inspection: Look for leaks, cracks, or damage in the fuel lines.
* Fuel filter: Even though you've checked it, it's worth replacing the fuel filter. Clogging can occur gradually and might not be obvious during a visual inspection.
3. Fuel Pressure:
* Use a fuel pressure gauge: This is the most definitive way to confirm fuel delivery. Connect a gauge to the fuel rail and check the pressure while the engine is cranking. You'll need the correct specs for your 190E model year to see if the pressure is within range.
4. Other Potential Issues:
* Fuel pressure regulator: A faulty fuel pressure regulator could be causing low fuel pressure.
* Fuel tank vent: A clogged vent can prevent fuel from flowing to the engine.
* Fuel lines blocked: In some cases, a piece of debris might have gotten stuck in the fuel line.
Additional Tips:
* Consult a repair manual: A specific repair manual for your 190E will provide detailed instructions for diagnosing and repairing fuel system issues.
* Seek professional help: If you're not comfortable working on the fuel system yourself, it's best to take your car to a qualified mechanic.
Remember to be careful when working with fuel systems. Fuel is flammable, and it's important to work in a well-ventilated area.
Let me know if you have any other questions!
