What I did to resolve the issue on my fuel cell was to run the vent line to a tee fitting. On one side of the tee fitting is a check valve that lets air into the tank to compensate for the volume of the fuel that is pumped out of the tank when running but not let vapors out. On the other side of the tee is an adjustable pressure relief valve so that the vapor has to build up a little pressure before it can be released. It’s set at a pretty low pressure setting so the fuel cell doesn’t become much of an expansion tank, which it’s not designed to be. After doing that, no more gas smell in my garage.
This sounds interesting. I just ran an aluminum fuel line vertically a few inches, made a u-turn and back out through the floor of the car. No gas smell in the garage that I've noticed.
But I like your idea better. What parts did you use for the check valve and pressure relief?
Mine was originally ran this way, down to a charcoal filter. The fumes were overpowering when I walked into my garage. After changing to the PRV and check valve setup, no more fumes.
The pressure relief valve is very similar to this one, but I think the range on mine is 0-15 or 20 PSI. It's currently set for somewhere between 1 & 2 PSI.
https://www.ebay.com/itm/0-100-PSI-Brass-CR-Series-Adjustable-Air-Pressure-Relief-Valve-Control-Devices/291696721009?_trkparms=aid%3D1110009%26algo%3DSPLICE.COMPLISTINGS%26ao%3D1%26asc%3D20200220094952%26meid%3D69b80d3bf80e4e23b3c577c6c1034a27%26pid%3D100008%26rk%3D1%26rkt%3D12%26mehot%3Dpp%26sd%3D113207571600%26itm%3D291696721009%26pmt%3D1%26noa%3D0%26pg%3D2047675%26algv%3Ddefault&_trksid=p2047675.c100008.m2219
The check valve was some used fuel check valve with 8 AN fittings from a person that sold used aviation parts off eBay. Any check valve made for fuels that stays closed, one way, even with no backpressure, will work.
I've had this on my car for about 8-10 years now. No problems.
