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Bill (guest)
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I understand that the fuel pump inside the gas tank should provide about 73 psi. It pumps through a line that goes into the HPFP. From there, fuel is pumped into the fuel rail, where it is available for the injectors. The car has great power and high RPM performance; idles smoothly; accelerates well. BUT after sitting more than an hour it acts like there is no fuel pressure; hard to start; dies; stumbles; etc. for maybe 30 seconds - but then comes to life and is good to go.
I am trying to diagnose whether the issue is the fuel pump in the gas tank, or the HPFP. A have not been able to get a fuel rail pressure reading yet. Any advice? Thanks.

This post was auto-generated based upon a question asked on our tech article page here: MINI Cooper R56 High Pressure Fuel Pump Replacement (2007-2011) | Pelican Parts DIY Maintenance Article
Old 10-29-2017, 07:24 AM
  Pelican Parts Technical Article Directory    Reply With Quote #1 (permalink)
Join Date: Jul 2012
Posts: 3,189
Do not measure at rail. You need a scan tool like Autologic AssistPlus to test the fuel delivery system on these MINI Cooper engines.

- Nick
Old 10-29-2017, 07:24 AM
  Pelican Parts Technical Article Directory    Reply With Quote #2 (permalink)

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