When I have a boost car, I always make sure the vac line is a dedicated line that goes to the fule regulator. I don't want the fuel pressure to be affected by a problem somewhere else in the car. And I always make sure its a very very tight fit. Either hose clamp it or tie wrap it. I want zero leakage. If you already have these done and it stii drops fuel pressure, I would say the pump is weak.
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