| Re: 88 Brougham fuel problem
Your description sounds like the typical leaking needle and seat in the carb. This can be related to the fuel pump replacement in a couple of ways. First, if you dislodged any crud or rubber particles from the hoses while changing the pump, that crud may have lodged in the carb and is preventing the needle and seat from closing completely. This can result in a higher than spec fuel level in the float bowl and will result in the car running very rich and bogging down at idle. Once you step on the throttle, you're using fuel at a higher rate and thus the engine will run OK. Another problem may be that the new pump is putting out too high a fuel pressure. This will result in exactly the same scenario that I described above. Put a fuel pressure gauge on the line where it enters the carb. Should be 5-7 psi.
Did the replacement pump have all three fuel line connections? There is the large rubber hose from the tank that goes to the inlet, the metal outlet line to the carb, and the smaller rubber fuel return line back to the tank. Some replacement pumps only have two lines and eliminating the return will cause a problem. Even if the new pump has all three connections, if the return line is plugged for some reason you could see higher than desired pressure at the carb.
Finally, replacing the pump on a 307 required disconnecting and removing a number of components. Be sure everything got hooked back up correctly. | 
