87 grand national gas tank 81 monte carlo gas tank

You also asked about a nice original air duct for the air cleaner, I'll look.ĭid a lot of looking for info on emissions, non-vented gas cap design, no definitive answer other than what Stant says on their website. Never had one fail or the need to put new carbon in one. I think damage is the #1 reason for failure. Most have a fiber filter in the bottom but they are difficult to change. I read your previous post about a filter or rebuilding the canister. With the gas cap off, inlet hose off that valve, and a little air pressure blowing back to the tank through that hose will eliminate that as a problem.Ī code 31 is thrown if there is a purge valve problem under most circumstances and even if there was a purge valve failure I don't think high pressure in the tank would be the result.

Also would think the valve should allow pressure in the tank to always flow to the canister. The tank pressure control valve is what you replaced? Would think that is a check valve that restricts flow from the tank when the purge valve is trying to purge the canister. Here's a pic of your emission hose routing, correct?

87 grand national gas tank 81 monte carlo gas tank