Yup
Brand new genuine GM - even pushed aside near the wing, away from manifold. (Car didn't have these issues on the old one, which I suspect is fine)
Brand new Bosch fuel pump (well about 2 weeks old if that)
C30 doesn't have stop start, it's before the 'rot set in'
Car idles like a dream, perhaps better than a month or two ago (there's been oil/filter/spark change, plug genuine Bosch DISpack changed since then, so not surprising) to the point I have to sometimes check the rev counter that the engine hasn't stalled, no sound or vibration in the cabin. But within a minute of
cold starting, changes are she'll just die. However warm/hot engine starts on the button, straight away.
We went out this morning on a bit of a test drive, (15 mins, then car stood for an hour, then back) and zero issues. Left lights and other draining systems off to be on the safe side, but battery voltage at
worst dropped to 12.65v after being left for an hour, but was 12.7-12.8 after each run. I'm going to check the battery later today, just to see how low it drops to, in case this 'spare' battery is 'as bad' as my original.
New battery has been posted so should be with me tomorrow.