I looked over the fuel lines on my new GS and the car originally had 3 lines, supply, return and vent. But right now only supply is connected and the other two are not. The motor has been built up and an electric fuel pump was added near the fuel tank. The electric pump feeds into the mechanical pump. Question is would reconnecting the other two lines cause a problem? I think not but I thought I would run it by you guys first.
The only thing, when the return is plugged on the mechanical it usually raises the pressure. No other downside to reconnecting the lines.
