Thread: 87 454 TBI eng

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Check the TBI incoming fuel pressure......they required somewhere between a carb and a normal injection 40 psi......dont remember what the exact pressure requirement is.

Originally Posted by robot

Check the TBI incoming fuel pressure......they required somewhere between a carb and a normal injection 40 psi......dont remember what the exact pressure requirement is.

Good point, Robot. The GM TBI likes 9-13psig at the engine, which is a lot lower than direct port injectors need to see.