I'm trying to retain my factory fuel "reservoir tank" (the small metal tank behind the passenger-side rear wheel arch) despite some fairly drastic mods.
In reference to the attached image:
- I've retained one large ventilation tube (#5) and it's connected to the factory location on the reservoir tank.
- I've eliminated two of the fuel tank ventilation tubes (#6 and #14) due to main fuel tank geometry.
- I've plugged the corresponding inlets on the reservoir tank (for #6 and #14).
- The reservoir tank is connected to the fuel filler hose as shown (and as designed by the factory).
I would like to use hose #13 ("Air supplier tube") as my only fuel tank vent/breather and run it outside the car, well-grommeted through the factory hole just behind the rear wheel arch.
- Is this an acceptable method of venting my tank?
- Is the fuel tank ever supposed to hold positive pressure? If so, this would make my solution incorrect...
- Should a fuel tank setup ever allow a vacuum to be drawn due to fuel consumption? If not, my solution solves...
- Is it correct to assume that since #13 is called an "air supplier tube" air must be able to flow:
----> in the blue direction to counter vacuum due to fuel consumption
----> in the red direction to prevent pressurization due to vapor expansion
- Is there a need for a check valve of any kind?
I did attempt to search the forum before posting but failed to find specifics to my questions above.