I think the competency of the writer is more in question than my mechanic.
We checked for spark right off the bat. I should have included that in the post. My mechanic specializes in Triumphs, but seems very disciplined about tracking down leads.

My question would be "if spark is present, and fuel is getting to the injectors, what would the next step be?" Could the pump not be putting out enough pressure? And what diagnostic steps should I take if the pump is not a potential fix?