Fuel system hose sizes?

[pjmoreland]

An EEC tank will have some rubber lines attached to it that could be cracked. There is a short section that runs from the filler neck to the top of the tank. Then there is another one that connects the tank to the line that loops up into the rear passenger pillar.

If you installed a fuel pump that has three attachment ports, and you attached the return port to the vent line, then the pump will be sending fuel back up the vent line to the tank, which is not its original purpose. The tank will have no way to vent excess pressure in this scenario.