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Discussion Starter #1 (Edited)
Why does my fuel pressure drop under throttle? It doesnt matter if vac is on or off. It also drops to around 30psi while under a few pounds of boost? pump? regulator?
 

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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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Make sure the fuel pump is wired correctly and not backwards (+/-). If it's wired backwards it will actually decrease fuel pressure just as you're describing.
 
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