1994 Buick Park Avenue Repair Question
1994 Buick Park Avenue
Could be anti theft, the wires break at key cylinder, or oil level low, oil pressure sensor cuts fuel pump off when pressure is low, also check the grounds under the drivers carpet at rocker, they grounded to aluminum and it tends to corrode there.
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It wouldn't be the security system because this car used PassKey which disables the starter. The oil pressure switch is NOT designed to interrupt the fuel pump supply. It is used as a redundant power supply to the fuel pump in case of relay failure, however a shorted oil pressure switch can short the circuit so try unplugging the switch. You need to monitor the fuel pressure while trying to start it to see exactly how it is responding for any further diagnosis.
14,743 answers provided