My 89 305 TBI starts OK, then immediately starts to die. I can prolong its death by manually operating the throttle body, but it coughs, spits, etc. Its not pretty. After checking out everything, I put a 30 psi (calibrated) pressure gauge in my supply line just before the steel tube that feeds the TBI. There was no pressure with just the pump running (key ON, engine OFF-pump runs for 2 seconds as it should). The pump pumps a pint in 15 seconds, per the GM specs. During the period that the car starts and tries to run, the gauge doesn't move. It seems that the pressure regulator in the TBI body, or the fuel pump itself, is bad. TBI was rebuilt using Borg-Warner kit 400 miles ago, including regulator. Fuel pump is original (115K miles). New inline filter also. My main question is: Shouldn't the fuel pressure be something around 9 to 14 psi during these conditions? Any guesses as to which one is the likely problem area?

 

Moving to TBI board....

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