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Need help on starting 1980 mercedes benz 300d been sitting idle for 5 years?

Here are the steps involved in starting a Mercedes-Benz 300D that has been sitting idle for 5 years:

1. Safety Precautions:

- Ensure the parking brake is engaged and chock the wheels to prevent the vehicle from rolling.

- Wear safety glasses and protective clothing to avoid contact with fuel, fluids, and dust.

- Disconnect the negative terminal of the battery to avoid electrical hazards.

2. Check Fluid Levels:

- Check and top up the engine oil level.

- Check the coolant level and ensure it's at the correct level.

- Inspect the brake fluid reservoir and fill it if necessary.

- Verify that the power steering fluid is at the appropriate level.

3. Inspect Fuel:

- Open the fuel cap and check for signs of rust or debris.

- Look for any cracks or damage in the fuel lines.

- Consider draining the old fuel and replacing it with fresh diesel.

4. Battery:

- If the battery is still connected, turn the key to the "ON" position and observe the dashboard lights.

- If the lights are dim or non-responsive, you might need to replace the battery.

- You might consider charging or replacing the battery for a reliable start.

5. Inspect Tires:

- Check the tire pressure and inflate them to the recommended levels.

- Inspect the tires for any signs of cracking or dry rot.

6. Engine Inspection:

- Open the hood and check for any visible leaks, cracks, or damage to hoses and belts.

- Look for any signs of rodents or damage caused by animals.

- Check for any obstacles that might prevent the engine from starting, like leaves, rags, etc.

7. Air Intake:

- Examine the air intake system for any blockages or obstructions.

8. Glow Plugs:

- Consider replacing the glow plugs, as they might have deteriorated due to inactivity.

- Preheating the engine using the glow plugs might assist in starting.

9. Starter:

- Attempt to start the engine by turning the key to the "START" position.

- If the engine doesn't start, you might need to tap the starter gently with a hammer to release any potential sticking points.

10. Fuel System:

- Check the fuel lines and fuel filter for any clogs or blockages.

- Consider using starting fluid or a fuel additive to assist in the starting process.

11. Patience:

- It's common for vehicles that have been sitting idle for an extended period to take longer to start. Be patient during the initial attempts.

Remember, if you encounter any issues or challenges during the starting process, it's best to consult with a professional mechanic who has experience with Mercedes-Benz vehicles.