Kody was over today and I had him help makeup these parts. I've been thinking about the
fuel vent fittings and wanted to make sure that my new design didn't adversely affect the
operation. Essentially the fittings need to create a bit of positive pressure for the tanks
by pointing into the wind. I decided to test the fitting with a manometer.
Here's the test rig. Kody's hanging it out the window to demonstrate how this will work.
There are two holes in this piece of plywood. One hole is flush with the surface. The other
hole has the fitting installed. There is a piece of clear tubing used for the manometer. It
attaches to one of the ports, comes inside the car and makes a U loop (which has water in it),
and goes back out to the other port. If the fitting is creating positive pressure, it'll push
the water level down in the side of the U loop attached to the fitting.
Here's an closeup picture. You can see the flush port about two inches to the left of the
fitting. This rig worked great and confirmed that the new design does indeed still make positive
pressure. At 60 MPH there is about 1 inch H2O pressure differential between
the two ports.