Re: Volvo MD7A Not Starting
Do you have access to high and low pressure gauges? Knowing fuel pressure at the inlet and outlet of the IP really helps with diagnosing something like this. It is usually pretty easy to hook up one on the inlet side but the high pressure side tends to be trickier and is more dangerous so you need to make sure everything is rated for the pressure.
When they serviced the injectors, did they make note of what the pop off pressure was and did they raise it? Over time, the pop off pressure tends to trend down and that may have masked a different problem.