It is a common practice clamp the fuel line to the engine pump to prevent flooding and also fuel drainback. If you do this you can still use one of the fuel dots to fill the the tank. The "old" pressure line needs to be routed to the bottom of the fuseage as a vent line. In essence the second dot becomes irrelevant.

Some guys are using an MK valve that you can open and close instead of an external clamp.

Regards,

Eric.