Hey everybody,

So I've been looking all over these message boards trying to find a way to replace that dang vent valve that hangs below the fuel tank behind the driver side seat. I saw things from brake booster valves to fuel filters, and decided to just make something up on my own. Through my research and observation that valve is a TWO WAY VALVE. I believe that it vents out when the tank pressure gets too high, and allows air in when a vacuum forms in the tank due to falling fuel levels. It would appear that it allows a slightly higher pressure than ambient which would provide a force to push the vapors through the purge canister under the hood. I went to Ace Hardware and bought two one-way check valves, two short nipples, a 1/2 inch PVC "T", a barb to pipe-thread fitting, two 1/2 inch caps (which I drilled small holes into) and a spring. This apparatus allows air to come into the tank very easily, and allows pressure to build up past ambient before it vents. I added the spring, to the check valve that allows air out, which provides more pressure on the seal from the back side (pushing the seal closed with more force than the current spring) making it harder for air to flow out. The cap on this check valve has a short nail on it which centers the added spring. The small holes in the cap allow air flow but prevent large particles and water from entering the valves.