Oil pressure switch redundant fuel pump power?
I have read that if you pull fuel pump relay while engine is running, the oil pressure switch would act as a backup and keep it running if the oil pressure stayed above 5psi. If the engine died, this indicated that the oil pressure sensor/switch needed to be replaced.
The Haynes schematic seems to support that theory. I have tried on both a '99 and '00 in both crank and normal operation and they both die. Are the sensors/switches bad? If not what would the purpose of the oil switches be?