On the sump area of my fuel cell there are 2, -8an outlets, and a vent fitting on the top. I know the vent must be plumbed to the outside of the trunk and Im using one of the -8's to feed the motor so I need to block off the other -8 fitting as I will not be using it. Whats the best way do this? Ive been looking at the different types of fittings available and cant seem to find something that would work.