Just to be clear, Does the y-piece in the fuel lines connecting feed and return (600ss wirth CV carburettors to be model specific ) have a directional non- return valve fitted to feed an return? I need to know because I'm not sure what was my feed and return hose since dismantling, wonder if it matters, because I am about to fit an externalised fuel filter. I imagine the y piece would have those valves. Another quickie - concerning electronics, priming and start up , Is the system configured so as to disengage the starter motor until the system is primed?
The Y-piece is just a Y-piece. It has no valves. The pump feeds fuel to the Y-piece and hence to the carbs. When the float needle closes the excess fuel goes up the other leg of the Y back to the tank. That's all there is to it. The filter should go between the tap and the Y-piece. I'm not sure what you mean by the system being primed, it's a carbed bike not fuel injection. There is nothing to stop the starter being operated at any time.
OK lads. Gotcha. I'm clear now - pump should run all the time, and so it does. No valves in Y piece. Much as I hoped. (my previous bikes didn't have the fuel pump and return - helpful to be certain about this one).
