Picked up a new gas tank to replace my leaking one on my 70 and it needs a deep cam vented cap. Unfortunately the manufacturer put the fill tube that requires the deep cam gas cap. I’m assuming it’s the same fill tube that the evap tanks use. I’ve ordered a couple and it seems they are all non-vented. I’ve tried “Motorrad mgc-807” and “Gates 31722” (which is a repackaged Motorrad brand anyway). These both fit but are non-vented and my carb runs low on fuel. When I tried to reuse my old cap, it won’t turn, not even close as the tangs are hitting the ramp of the cam lock. My tank only has the hole for the sending unit, not all the other connections for evap and what not.