Usually when I unscrew my gas cap there's a slight hiss and pressure relief, but nothing major. Yesterday after I got back from a ~30 minute drive with a big uphill climb right before home I unscrewed the cap and there was a ton of pressure. Gas was boiling up almost to the point of spilling out of the tank, and fumes/vapor continued flowing out for over a minute or two. I've done some quick research, and it appears some similar themes are vacuum lines and the EVAP canister. I definitely think the big black canister by the fuel tank could be clogged, and I believe that's the EVAP canister. I have been noticing a weird hiss/wheezing coming from there when the truck is off. I also re-routed my vacuum lines recently. They were configured in a way inconsistent with the diagrams and other members trucks, including a nozzle on the bottom right of the carb not being connected to anything at all, and from what I can tell everything is now as shown in the diagram. However, I suppose this other configuration was a workaround for whatever problem I may be seeing now (clogged EVAP canister??). Just spitballing here. The truck always ran fine like that, although I do feel like I have more high end power now (I live in a hilly area - it's a struggle to get this thing to 80 km/h unless I'm going downhill). I also know it has been mentioned there is a one way vent on the gas tank but I have never seen this/don't know where it is? Other things of note: -Truck has been starting reliably but also reliably taking a lot of cranking. I usually need about 15 seconds of cranking in 2-3 intervals to get it to go. I get a very low rumble at first and then it picks up steam and gets going. It can stall on reverse if I don't give it enough gas until it warms up. Been meaning to look into this but have been swamped using the truck to get stuff done. -My exhaust tailpipe rusted and fell off while driving last summer and I have yet to get it fixed -When I replaced the fuel filter recently, I noticed I had a steady stream of gas coming from the tank, even when I opened the gas cap and released the pressure. It kept going and filled up multiple gallons in a container until it slowed down. Is this normal?