If they are spring loaded, they must need power to remain fully open, so I assume keeping them powered all the time (only when the vehicle is running) won't hurt them.I thought the same thing, I fiddled with them for about 10 minutes last night trying to get them fully open and I’m pretty sure they’re spring loaded. At least that’s what it felt like because I used a long metal stick to apply pressure and was able to get them fully open but as soon as pressure was released it would go back to pretty much the same spot.
That would be super convenient! If you’re able to do that I’m gonna need a bit of a tutorial because I know what the switch and relay are but I have no idea how you’d get it to open the valves.
Off the cuff, running a ignition switched 12VDC source through a SPST switch to the valve should suffice. I would probably get sued if I posted a schematic on how to do this, but your welcome to PM me. In the interim, I am going to look for schematics for the valve and/or purchase a used valve.