Ok guys i really need some help here. I need the charcoal canister hose routing for a 91 xj 4.0. Mine is unhooked and i need to know what ports go where.

 

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So I have basically the same question as OP and could not find the simple answer. Searched here and google. So, I know A is the vacuum line to IM, B is clean air hose to air box. My gas tank vent is disconnected and don't know what side it goes to. Can somebody take a look and give a definitive answer.

92 4.0

 

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Sorry to pull up an old post but I have this same hose laying at the back of the cylinder head and don't see a location to hook it to on the vapor recovery canister. One of the open ports is plugged with a hard plastic plug and the other has a "t" in the opening which also looks blocked. Does anyone have an answer on this? Thanks

 

Skip the charcoal canister altogether and just connect the tank to pure vacuum. The charcoal eats the vapors from the tank. The vapor is the only combustible part of the gasoline. It's actually eating up the most explosive part of the gas as the ethanol and hydrocarbons settle near the bottom while the pure explosive portion of gas vaporizes (that's why when you let a car sit with gas in the tank for a long time it is hard to start). You'll finding starting your engine is easier as well. You can also skip the solenoid it goes to and go straight to the engine for stronger vapor mixtures, although some might flame out against in case there is a mis-fire. That can easily be taken out of the equation by using some simple mesh-screen (aluminum, at lowe's, you can buy it in small squares for a few bucks). It acts as a flashback arrestor. Flame fronts can't travel through screens.

It will causer a richer condition making the injectors back-off on spraying inefficient mists that can't fully combust anyways. I'm working on making a vaporizer tank at the moment to get off of fuel injection completely. I've managed to cut my fuel pressure down to 18 with the tank supplementing. Won't be long before I fully realize the dream.

P.S. Vapor canisters can also become plugged up over time from saturation. If you're driving a 91 it's probably high time you bypassed it anyways.

P.S.2. If you decide to skip the solenoid altogether like I did make sure your gas cap is fully seated or you will have a vacuum leak.