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Symptom summary
1) fuel pump voltage is erratic
2) fuel pressure is also erratic
Did you happen to notice what your oil pressure was doing during this episode?
Suggests to me that either you have:
1) erratic oil pressure that is causing the OPSS to cut in and out leading to erratic voltage and pressure
2) intermittently failing OPSS leading to erratic voltage and pressure
3) failing fuel pump
I think I would try bypassing the OPSS and seeing if it starts. If it does start, monitor the oil pressure carefully. If oil pressure is ok and fuel pump voltage/pressure is steady I would conclude OPSS is the problem.
If oil pressure is ok but fuel pressure is not steady, fuel pump likely problem.
If it does not start and there is fuel pressure then maybe not a fuel delivery issue. Check for spark.
If it starts and oil pressure is erratic that is a different kettle of fish.
Hope that helps,
Peter
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