OK, so a few replies. Main one from edlinlr is an accident. Can you stop the fuel leaving the tank? well it depends on how big the accident was. A 200mph end-over-end will trash even the best made system. For a less violent accident it depends on what is damaged and which side of the tap, if you have one, the damage is or even are the handlebars still attached?
EFI bikes with in-tank electric pumps have no fuel shutoff, killing the power is the only way. Any crashed bike with the engine still running needs an "off switch" this is the lanyard AND the handlebar on-off switch. Both stop the engine, and if the engine is stopped the pumps stop whether they are electric or mechanical.
A bike with fuel taps & carbs will leak fuel out of the carbs until the tap is off and the carb is empty. An EFI bike will leak out of an injector damaged in a crash if there is fuel pressure in the line until the line is empty.
In reply to POPS. Leaving the solenoids powered open implies power. The lanyard removes all power.
In reply to Revolutionary, If we are decelerating then the engine is still running. If we kill the motor then we kill everything. The pump will still pump fuel around and back to the tank, but it cannot go anywhere else. However if the motor is dead but is turning on the over-run, and say a fuel line has failed, then clutching it will stop the pump.
In reply to Stainless, the pipe between bottom of tank & pump is a 10" #10 Goodrich with a torturous route. Adding 2 more fittings in that line will add 2 more connections that could leak fuel because that is the lowest point in the fuel system.
At present, rule 7.B.2.5 say a handlebar mounted fuel shutoff operable without moving the hands from the grips. 7.B.2.1, 7.B.2.2 and 7.B.2.3 cover this as our Engine Stop switch (operable without moving the hands from the grips) and our lanyard kills everything causing the motor to stop, and therefore pump stop.
I thank Rex for his input today. Rex uses a std 3-way Kinlsler valve which is not a shut off but a diverter. These are accepted as a recognized fuel shut off. However, the diverter is not a fuel shut off as the fuel still runs from tank to pump and back to tank. You use it to stop the fuel getting into the engine, i.e, it stops the engine running. The EFI system is doing just the same, tank to pump to regulator to tank. If we stop the injectors running the fuel still goes back to the tank but the engine stops. So is this rule "Engine stop via fuel control" or "Fuel leakage control"?
We are not back until 2020, so there is time and I don't think I am the only one with a question on this. I maybe one of the few with mechanical pumped EFI turbo methanol on a bike, but not cars, so what do they do?