Have this old CRX. Was running. Had a mallory red pump. Fuel injected motor. 1st gen car.

I cleaned the fuel cell, put in some new lines correctly, one out and one vent back. Doing so I saw they had the old pump still in the lines. I removed the old pump, it was not connected, but the fuel ran through it.

Car won't run. There is fuel to the injectors. If I spray start fluid in a vacuum line it starts right up then dies.

Was that old pump doing something with pressure?