Trouble Shooting guide for your Cars Vapor Canister

In the mid 1970s, automobile manufacturers began installing pollution control systems on engines to help reduce emissions put into the atmosphere from automobiles. The system is also used on fuel-injected vehicles with the only difference being the gasses are sent into the intake rather than the carburetor. It is a component of a vehicle’s evaporative emission control system and prevents the evaporating fumes from reaching the atmosphere while also maintaining proper fuel tank pressures.

The fuel vapour canister, also known as a charcoal canister because it is filled with charcoal, is part of a vehicle’s pollution control system and is used to capture fuel vapors emanating from both the fuel tank and the carburetor. The vapors are pulled into the canister by a vacuum as the engine is started, and then fed back into the fuel system to be burned when the engine is running.

The most common reason for a failure in the fuel vapor canister is a crack in the canister or a hose. In order to test it, nitrogen is applied to create pressure, and then it is tested periodically for a drop in pressure, which will indicate a fault in either the canister or a hose. Nitrogen is always used to test for leaks because introducing air into the canister could lead to a dangerous fire, explosion, or other incident caused by adding oxygen to the fuel vapors.

There is no required service for the device beyond keeping the hoses and canister clean and free of debris. A cracked hose will cause the “check engine” light to come on in a vehicle’s dashboard display area, alerting the driver to a potential problem with the vehicle. Other areas that may cause the warning light to be seen are a faulty fuel tank cap or a loose or incorrectly-tightened cap. There is also a valve on the canister and the intake that are both vacuum-activated and could cause the warning light to come on should a malfunction occur.

Tools required to replace your Cars Vapor Canister: Car Jack, Bricks, Wrench, Pliers.

Step 1 – Preparing your Car for replacing the Vapor Canister

You will have to 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 – Process for Removing the Vapor Canister

Then locate the vapor canister at the rear of your 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 for damage.

Step 3 – Installation of the New Vapor 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.

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