If the tank doesn't have a vapor dome then you will just have to remember to not fill it full. Or only fill it full when you are driving somewhere. The gas comes out of the ground tank at 60 degrees so on a hot day the gas will expand once it gets into the tank. Without an expansion tank the gas will just push out the vent. I ran into this same issue when I had a fuel cell in a race car. The fuel cell was just a box with no expansion area. I filled it up on a cool day and then on the next hot day I had a mess when gas started to push out the vent tube.
This is what I’ve come up with to solve my vent issue. 1 gal fuel cell with built in roll over valve, plumbed using -6an PTFE hose. Should provide some sort of expansion for the fuel coming out the main tank vent port. Mounted on top it the IIMuch vent system. The vent system will then route to a sintered filter mounted to a bulkhead fitting. I haven’t finished mounting the 1gal cell yet but you get the idea. I’ve used body plugs as I didn’t want to drill any unnecessary holes in the trunk. Trunk will eventually be finished with removable panels. The IIMuch system came with a stick on thermometer that I mounted to my fuel tank and it definitely shows how hot my fuel tank gets here in Southern Georgia. [img]http://[/img]
