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We seem to have moved away from alternators (problem solved with £80 ish alternator) and onto what appears to be the major problem with the GVs or this 2.8 CRD engine in particular i.e. fuel related issues. I have had problems ever since buying the old girl (Dec 2019), I think I am going to bite the bullet and get a new pump, problem is I am not 100% convinced it is the pump, if it was I would expect a more consistent fault ? I think I'll open a new (repeat) thread on this issue.

Okay, not whishing to hijack this post as my knowledge of Alternators is next to zero other than many years ago I had a doggy Alternator tested in a 'Lucas' test shop to say it was the 'Diode' ? which was only a 1/3rd of the cost of a new one. Which I then bought and fitted (2 wires) for it then not to work and the shop say that something else was wrong, which couldn't have been diagnosed until the Diode fault had been cleared. Consequently from that day on, whenever it arose I have simply replace a dodgy one with a new/rebuilt one, and while I haven't change my GV one, it looks to be a very straightforward job. That said, my GV does have an Alternator fault whereby the battery drains after about 3 days which I think is a 'leak' through the Alternator. My solution was to buy a Battery terminal isolator for a few £s off of eBay, which other than the slight inconvenience has worked well for nearly 2 years So onto RichardM's issue, when I say pump's output, it's the 'Injection System I'm talking about, inasmuch as it's common rail diesel CRD implying that the 'injection system' is always pressurised ready for each injector to fire. If the system is not pressurising it's either the common rail (high) pressure pump letting by or the lift pump letting by (could be same pump) (I'm not that knowledgeable). Or, it's allowing/letting in air when at rest, which then needs purging on starting from such as a fuel rail leak, or leaky (perished) feedbacks from the Injectors, or leaky filter, etc. There is also a bizarre fault mode (on some cars) whereby it messes about starting depending on whether you have the car facing uphill or downhill . Other indications of fuel delivery issues are how well its running and (especially) for starting how much and what smoke comes out the back, although in your case the easystart will make that diagnosis difficult .