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Long Crank Times and Occasional Stall on my 2022 S580 - Fuel System?

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Dan C. · rep 0 · May 22, 4:13 AM · 1 replies · solved · Question

Vehicle: 2022 Mercedes-Benz S580

Hey everyone,

I'm experiencing a really frustrating issue with my relatively new 2022 Mercedes-Benz S580. Lately, when I go to start it, it takes a noticeably longer time to crank before the engine finally catches. It's not every time, but it's happening more frequently.

Even more concerning, twice now, after a long crank, the engine has started but then immediately stalled out. I have to try starting it again, and usually, it fires up on the second attempt. There's no check engine light on yet, but I'm worried this could be a sign of something serious with the fuel system.

Has anyone with a newer S-Class or similar Mercedes experienced long crank times or stalling? What should I be looking at?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:13 AM

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ClearTheCode admin answer:

Long crank times and occasional stalling on a 2022 Mercedes-Benz S580, especially without an immediate check engine light, often point towards a subtle issue within the fuel delivery system. Given the vehicle's age, it's unlikely to be simple wear and tear.

Here's what could be happening and what steps to take:

  1. Fuel Pressure Issues: The most common culprit for these symptoms is insufficient fuel pressure at startup. This could be due to:

    • Low-Pressure Fuel Pump (LPFP): Located in the fuel tank, if this pump isn't building pressure quickly enough, the engine will struggle to start.
    • High-Pressure Fuel Pump (HPFP): The S580 uses direct injection, requiring an HPFP. A failing HPFP might not maintain adequate pressure, especially after the car has been sitting.
    • Fuel Pressure Sensor: A faulty sensor could be sending incorrect readings to the ECU, leading to improper fuel delivery.
    • Fuel Filter: While less common on newer vehicles, a partially clogged fuel filter could restrict flow.

  2. Fuel Injector Leakage: A leaky fuel injector could be causing a drop in fuel rail pressure when the car sits, leading to longer cranks as the system has to re-pressurize.

  3. When to See a Shop:

    • Immediately: Do not delay having this checked. Stalling, especially at critical moments, is a safety concern. Also, prolonged cranking can put strain on the starter motor and battery.
    • Professional Diagnosis: A Mercedes-Benz dealership or a specialist shop will have the diagnostic tools to monitor fuel pressure (both low and high side) during cranking and running conditions. They can also check for any pending fault codes that haven't triggered the check engine light yet (e.g., P0087 - Fuel Rail/System Pressure - Too Low).
    • Repair: Based on the diagnosis, the repair could involve replacing a fuel pump, a sensor, or potentially an injector. Given it's a 2022 model, it should still be under warranty, so ensure you take it to an authorized Mercedes-Benz service center.
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