This one is short n simple. The stock fuel tank vent is just a length of hose routed to be able to vent but not allow fuel to slosh out. The vent is needed to allow air to move in and out as fuel is added and used.
First, I upgraded the vent to a larger unit to prevent issues with how fast the fuel can be pumped in. Breeze big vent. Then I routed the hose up and over to the left side of the car and built this vent filter. It will help capture any fuel vapors to keep things smelling nice. Its filled with a filter bag and some filter charcoal that I bought at an aquarium store. Then one end has a 1/2″ hose barb fitting and the other end has a bunch of 1/4″ holes drilled in it. Its only temporary mounted… that will be finalized as the rear sheetmetal is installed.