@GLTHFJ60 That pic also shows the vent ports at top. Did you keep the spaghetti mess or close off those ports? The biggest one is for that filler neck vent line that should be kept but the rest I capped off because I took out that multiport thing in the quarter panel. I haven't had any issues with vacuum on the fuel tank but I think others might have.
I originally had them capped, all but the necessary filler neck vent and one to provide a vent, but continually had issues with fuel being pushed out of the somewhat short vent line on hot days. You know, fill up at night on the way home, next day when it's hot fuel is pushed out of the vent.
This spring I hooked up the big spaghetti thing again with a longer vent line hoping to combat this problem, and it's somewhat better. I think having more vent line "volume" helps, but the issue is not resolved. With a full tank, at extreme uphill angles, fuel starts to drain out of the vent.
Where did you route your fuel tank vent? I'm thinking my next move is to route the vent line to the front of the truck and hook up a breather.
So to prep this looks like I need to pressure wash that area so I don’t get debris in the tank. Once the hose is off then cap line to tank to keep any debris out. Did you guys reuse the short fuel hose or get a new one.
I reused mine, but in hindsight I should have replaced it. It's rock hard now.
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