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1989 454 ,fuel pump stops after 5 sec., oil pressure sw is new

I have a 1989 454 carbureted Crusader with new electric fuel pump (carter)starts and runs about 5 seconds then quits. Oil cutoff switch is new. If I wire a lead from the positive post directly to battery it still shuts off after running the engine about 5 sec. Could I be losing ground? Defective pump? Is there a relay in the system? Fuel pump runs fine when ignition switch is on, starts fine then dies. It will start again but same issue. Oil pressure is 50. Any help greatly appreciated!
 
... If I wire a lead from the positive post ...

If you are referencing the fuel pump, it could be a ground issue....but...I'd check to make sure the ignition system is still working after the engine dies.

I don't believe there's any relay in the factory wiring configuration....
 
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