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Long Cranks and Stalling on 2018 Clubman S

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Mike T. · rep 0 · May 25, 4:56 AM · 1 replies · solved · Question

Vehicle: 2018 Mini Cooper Clubman S F54

My 2018 Mini Cooper Clubman S (F54) has started having really long cranking times, especially after sitting for a while. Sometimes it takes two or three tries to start. Once it's running, it idles a bit rough and feels like it's down on power.

I haven't seen a Check Engine Light yet, but the performance drop is noticeable. It feels sluggish and not like its usual peppy self.

Could this be a fuel delivery issue? I'm thinking maybe the fuel pump, but I'm not sure if it's the low-pressure or high-pressure one. Any ideas what I should check first?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:56 AM

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ClearTheCode admin answer:

Your symptoms of long cranking times, rough idle, and reduced power on your 2018 Mini Cooper Clubman S (F54) are classic indicators of a failing High-Pressure Fuel Pump (HPFP). The B48 engine, like many direct-injection engines, relies on both a low-pressure pump (in the tank) and a high-pressure pump (on the engine).

Common Causes:

  • HPFP Wear: The HPFP is a mechanical pump that can wear out over time, losing its ability to maintain the necessary fuel pressure for direct injection, especially after the car has been sitting and pressure bleeds off.
  • Fuel Quality: While less common, consistently poor fuel quality can potentially accelerate wear.

Potential OBD Codes (if CEL illuminates):

  • P0087: Fuel Rail/System Pressure - Too Low
  • P0088: Fuel Rail/System Pressure - Too High (less likely with these symptoms)
  • P0190/P0191: Fuel Rail Pressure Sensor Circuit Malfunction/Range/Performance

When to See a Shop:

  1. Prompt Action: While not immediately catastrophic, a failing HPFP can eventually lead to stalling, misfires, and potentially damage to other components if the engine runs too lean.
  2. Diagnostic Scan: Even without a CEL, a professional diagnostic scan can often reveal pending codes or show real-time fuel pressure readings that confirm an HPFP issue.
  3. Fuel Pressure Test: A shop can perform a fuel pressure test to confirm if the HPFP is not meeting specifications.
  4. Replacement: If confirmed, the HPFP will need to be replaced. This is a specialized job as it involves the high-pressure fuel system.
  5. Avoid Prolonged Driving: Continuing to drive with a severely underperforming HPFP can lead to further drivability issues and potential engine damage.
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