Hi Nick! I have a base model r56, and I'm trying to diagnose why my car intermittently coughs and loses power at highway speeds and while going uphill on the highway. Right now, I suspect the engine isn't getting enough fuel on the highway.
I checked the voltage at the fuel pump relay during starting, and I got around battery voltage ~12.6 volts. However, when I check pin #2 of the fuel pump connector figure 8 of your instructions during starting, I get only 11.3 volts. Does this mean there's an issue with the wiring, as the pin is not receiving the full battery voltage? I tried measuring resistance from the relay to the fuel pump connector, and from the fuel pump connector to ground, but didn't measure any significant resistance.
If there is an issue with the wiring, how can I access the wiring to inspect it? I have the bentley manual, but I'm unsure where the fuel pump wiring runs through.
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MINI Cooper R56 Fuel Pump Testing (2007-2011) | Pelican Parts DIY Maintenance Article