Starting is determined by fuel rail pressure, anything that causes it to drop below a specific point will prevent it starting.
It could be the HP pump but I doubt it, more likely to be an internal leaking injector pulling the pressure down or the pressure regulator on the HP pump.
I fitted a secondhand pump from ebay on my C5, cost me about £60 but it wasn't that anyway it was the pressure regulator, don't know if its the same as the early engine but I got one of those from ebay for about £25 I think it was.
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