1. Fuel Pump Check:
* Listen for the pump: Have someone turn the ignition key to the "ON" position (not starting). You should hear a brief whirring sound from the fuel pump. This sound usually lasts only a few seconds. If you don't hear it, the pump may be faulty or its relay is malfunctioning.
* Check the fuel pump relay: Locate the fuel pump relay (consult your owner's manual or a wiring diagram). You can try swapping it with a known good relay of the same type (if you have one) to see if that solves the problem.
* Check the fuel pump fuse: Similarly, check the fuse for the fuel pump.
2. Fuel Filter Check:
* Locate the fuel filter: Find the fuel filter (usually located near the fuel tank or engine). It's typically a cylindrical metal or plastic canister with fuel lines connected.
* Inspect visually: Look for any obvious signs of damage, cracks, or leaks. A severely clogged filter will be difficult to see from the outside.
* Consider replacement: Given the age of the car, it's a good idea to replace the fuel filter regardless of its apparent condition. It's a relatively inexpensive part, and a clogged filter is a common cause of this symptom.
3. Fuel Pressure Check (More Advanced):
* This requires a fuel pressure gauge: You'll need a fuel pressure gauge specifically designed for your car's fuel system to accurately measure fuel pressure at the fuel rail. This is a more involved task and may require some mechanical knowledge. Consult a repair manual for the correct procedure and pressure specifications. Low or no fuel pressure confirms a fuel delivery problem.
4. Other Potential Issues (Less Likely but Possible):
* Clogged fuel lines: While less common than a filter problem, it's possible to have a severely clogged fuel line. This would require more extensive investigation and potentially replacement of sections of fuel line.
* Fuel injectors: Faulty fuel injectors could prevent fuel from reaching the cylinders even if the pressure is good. Testing injectors usually requires specialized tools and knowledge.
* Ignition system: Although you suspect fuel, a weak spark or other ignition problem could also cause a no-start condition. You should consider checking the spark plugs, ignition wires, distributor cap, and rotor (if applicable) as well.
Important Safety Considerations:
* Work in a well-ventilated area: Gasoline fumes are flammable and dangerous.
* Disconnect the battery negative terminal: Before working on any fuel system components, disconnect the negative battery cable to prevent accidental sparks.
* Avoid open flames: No smoking or sparks near gasoline or fuel lines.
Recommendations:
1. Start with the easiest checks: Listen for the fuel pump, check the fuel pump relay and fuse.
2. Replace the fuel filter: This is a relatively simple and inexpensive part to replace and is a common culprit.
3. If the problem persists, consider a fuel pressure test: This is a more advanced step, and if you're not comfortable doing it yourself, take it to a mechanic.
If you're not comfortable performing these checks yourself, it's best to take your 190E to a qualified mechanic. They'll have the tools and expertise to diagnose the problem accurately and efficiently.
