Solenoid valve

I would like to run a return fuel line from my Webers back to the tank( R or L). I need some sort of valve to direct it back to the tank which is being used. Any suggestions?

Google Pollak valves. They make several that do what you want.

I have no direct experience with solenoid valves but in researching these myself saw some reservations regarding Pollak temperature range and flow rate in a mostly similar application (veg oil, not gasoline) (see SVO Valves Better than Pollak - Bio Fuels Forums)

I have done it with a restrictor pellet in the return line.
It will be a surprisingly small hole,but the hole will be relative to your pumps ability and how much you need to bleed of.

I did it through trial and error.
A needle valve may be an easy way rather than pellets.

Jim