Get a vented gas cap, plug the two lines at the tank or conect them together with one hose, plug the lines from the carb so there aren't any vacuum leaks. Don't understand what you are saying on the CTO valve
Thanks for the replys, I think figured out my CTO question. I thought that Manifold vacume might come right through it since its bolted to the manifold. Looking at the Vacume drawing it appears that all the vacume sources come to it on the hoses.
No you don't have to plug the nipples it is a thermal switch that switches the source of vacume from ported to manifold depending on coolent temperature...it should go to your distributor,so you will need to hook a direct line from a manifold source of vacume ....and you will need to plug the hoses either where they connect to the CTO or plug them at the source.......The CTO is said or intended to improve cold weather drivability swithcing from ported vacume when cold to manifold vacume when the engine temp. reaches specified tem.Being in Maine you may want to consider this before disconnecting them.
Dumb question. Where can I find a vented cap that fits an 87 YJ? What vehicle do ask for at the parts store for this cap? Junkyards are out because the nearest one is too far away from me, costs me an hour each way and gas, to take crap from these guys who don't want to be bothered with the small stuff. In looking at parts lists it appears that the earlier jeeps had a completly different cap.