My left fuel tank for whatever reason is building up pressure in it whenever the airplane sits. It vents fuel back through the vent line when this happens. The fuel level is below the vent line level in the tank filler neck. I figured it was probably a partially clogged vent but I have checked the vents, blown them out both directions with no issues. I can't figure out what the heck is going on. I never have problems with the tank feeding or leaking in flight. I didn't build the airplane but I am also wondering if maybe the fuel vent line inside the tank is possibly loose on the fitting where it exits the tank? I recently rebuilt the tank caps with new parts from Vans and I have no leaks anywhere. The right tank is ok, changed the cap from left to right, doesn't help. Anybody have any ideas?
thanks
thanks
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