Motorcycle tank valves have two fuel supply tubes, one is a couple of inches tall, the other is about 1/2 an inch. Some of the kit supplied valve for bikes have the same set up but slightly shorter.Have some of the gas tanks have a reserve with the associated 3 position valve? Something I wonder about the 3 position valve is I think I once put on reserve on a motorcycle an then the engine ran out of gas. I was told I had to have it on the run position and I started up and went. So what I wonder is did the run gas chamber while riding on run fill the reserve? Or does reserve and also run chamber only get filled some how when filling up on gas?
When in the "on" position a petcock gets fuel thru a tube that sticks up inside the tank. Usually an inch or so. Once the fuel drops below that you run out of gas ... but not really. There's still an inch left. When you go to reserve it lets fuel flow right from the bottom of the tank and you can still get to a gas station. Or home.Have some of the gas tanks have a reserve with the associated 3 position valve? Something I wonder about the 3 position valve is I think I once put on reserve on a motorcycle an then the engine ran out of gas. I was told I had to have it on the run position and I started up and went. So what I wonder is did the run gas chamber while riding on run fill the reserve? Or does reserve and also run chamber only get filled some how when filling up on gas?