When I was building my buggy and contemplating the alteration of my fuel tank for buggy use I thought about the vent. I also considered adding in an aftermarket charcoal canister to capture the fuel vapors as they escape the tank, especially on hot days. So in a DSB thread about fuel filters was the idea to put a cheap $.99 filter on the vent and also use it as a spare. This idea gave my one of my own and I thought why not use the filter as a canister of sorts. Problem was finding the charcoal and figuring out how to keep the charcoal in the filter while allowing for equalization of air pressure in the tank and atmosphere. I think I've done it. I found activated charcoal at a local natural food store. It comes in a handy capsule form and even helps with occasional digestive discomfort!* The filter I have laying around and all I needed was some foam. Found that and with the assistance of a hole punch got a length in the correct diameter. Pics!!! First, the ingredients!!
This next part was a bit messy and I have to admit I didn't want to touch my phone, uh... er... camera. I took about twenty of the capsules and dumped each one into the inlet end of the filter. Once the charcoal was in the filter I rolled the foam piece and stuck it in the neck of the filter inlet. That's it. I cleaned my hands and took this pic.
There you have it. One bench top fuel tank vapor charcoal canister ready to be installed. I just fit a small hose on the relocated vent and the filter/vapor canister on the other end of the hose. Installation complete...
*This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.