How to Replace a Vapor Canister

What You'll Need
Car Jack
Replacement Vapor Canister

The vapor canister in your car is designed to reduce carbon emissions, and they are sometimes known as carbon canisters for this reason. The purpose of the vapor canister is both to eliminate emissions, and also to increase fuel efficiency. This is done by stopping hydrocarbons from being carried into the atmosphere, and channeling them back to the engine to be burned. The canister does this by trapping gases, using small carbon or charcoal blocks. If you worry that your canister is not working to the best of its potential, then you may choose to replace it. This is not difficult to do, but you need to make sure that you follow the steps closely, in order to fully replace the vapor canister.

Step 1 - Prepare the Car

Park your car on a flat piece of ground, and then find the fuel system rely, which will be marked "C/Opn" on your relay panel. Take this off, and then start the engine, allowing it to run until the fuel inside the engine is used up, whereupon the engine will stop of its own accord. Then, disconnect the negative battery cable. Go to the rear of the car, and raise it up in the air using the jacks. Support it with jack stands, and then put bricks in front of your front tires, to prevent the car slipping.

Step 2 - Remove the Vapor Canister

Locate the canister at the rear of the car. It will be near the fuel tank, at the back of the car. Disconnect the hoses which attach it to the fuel supply, using a pair of pliers. Place the pliers onto the clamp, and then slide this clamp down the hose until it is loosened. You can then take off the hoses. Use your wrench to unscrew the bolt, which holds the vapor canister in place. Then, extract the canister, and take it to your garage, where you can inspect it. If you think that you need to replace your vapor canister, find the reference number, and use this to purchase a similar model from your local car store.

Step 3 - Install the New Canister

Take the new canister, and slide it into position next to the fuel tank. Bolt it back into the same place. You should insert the bolts and hand-tighten them first, and then use the wrench to fully secure the canister to the frame of the car. Take the hoses, and attach them to the canister. When they are fitted, use the pliers to slide the clamps back up the hoses. The clamps should now be firmly fitted to the underside of the car. You can then replace the engine relay connection. Remove the jacks, and take the bricks from in front of your other wheels. Finally, reattach the battery cable, and start the car, to check that the fitting has been done correctly.