The cutoff for the vented caps on the wings is sn 4424. Reference the Ercoupe parts catalog.
Due to the way things have been swapped around over the years, I'd be absolutely certain the fuel system you have matches the configuration from the factory before switching to unvented caps. The penalty for being wrong is much more severe than if you put vented caps on a system that doesn't need them. John Cooper Skyport Services www.skyportservices.net _____
