[spasticone]

Ok. This is my brother-in-laws car. 90 lumina 3.1.
All of his work up untill this, has been done by his mechanic. it's had lots of new parts including 4, yes 4 ecms... Last week it had a fuel pump, and when installed it burned out the pump. So the guy threw in a new module AND a new pump and it was ok for a week. now it's stuck in the middle of my driveway. It turns over like crazy but won't start. When I turn on the key, I can feel the relay in the little "Fuel pump relay box" click, but as of yet, no fuel pump whine. I fould online that you can bridge terminal 87a and 30 on that relay and the pump should run, but it doesn't seem to work. Oh yeah, It throws a code 54. What's "low voltage in circuit'? What next???? Please help me out as I need my driveway and he needs his car. I'm reletively competant so throw some tests for the fuel system or ecm my way. Thanks in advance.