Can anyone tell me what the tube inside the cobra tank is suppose to do(the one sticking up on the very bottom) and if you are suppose to have it hooked up ? I have heard some people say it doesnt not have to be hooked up
It's just to allow fuel into the sump, but makes it harder to slosh out under acceleration. As you see it is how it should be, nothing attaches. The small part sticking up is just a vent to stop any flow issues.
You can see the PPRV here, it's just a valve that let's the excess pressure out of that nipple (no hose attached). It has nothing to do with the line your asking about.