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Charcoal Canister Replacing
 
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Pelican Technical Article:

Charcoal Canister Replacing

Nick Czerula

Time:

3 hours3 hrs

Tab:

$200

Talent:

***

Tools:

T20 Torx driver, flathead screwdriver, 8mm, 10mm sockets

Applicable Models:

BMW X5 (2000-06)

Parts Required:

Charcoal canister, lines or hoses

Hot Tip:

Be careful when working with evap system, do not damage any hoses or connections

Performance Gain:

Repair evap system faults

Complementary Modification:

Replace evap hoses

With increased Federal emissions standards, BMW has been required to decrease both tail pipe emissions and the evaporative emissions. Evaporative emissions consist of volatile organic compounds (VOC), such as hydrocarbons from fuel and engine oil. Both of which vaporize and can escape from the vehicle into the atmosphere if not recovered.

The charcoal canister is an emission control device and consists of a sealed plastic canister of activated charcoal with hoses and lines at the side. It's used as a temporary storage device for fuel vapor or HC (hydrocarbon) from the fuel tank. This prevents excess fuel vapors from exiting the fuel tank and entering the atmosphere.

When the engine is off, fuel vapor from the fuel tank passes through a vent line into the canister where it is absorbed by the charcoal. When the engine is running, the fuel vapors are routed to the engine via an electronic solenoid and drawn in by intake manifold vacuum. Controlled by the DME using a programmed duty cycle in order to maintain proper fuel mixture.

The charcoal canister is located on the left side of the vehicle, underneath near the fuel tank.

Remember your car may have been serviced before and parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve as they grow older. If something seems different, let us know and share your info to help other users. Questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

Jack your vehicle and support it using jack stands. See our tech article on jacking up your vehicle. Always wear your safety glasses whenever you're working under your car.

The charcoal canister is tucked away behind the fuel tank splash shield.
Figure 1

The charcoal canister is tucked away behind the fuel tank splash shield. You will have to remove the splash shield to access it. I prefer to unbolt the shield, then let it hang so I can access the canister. See our tech article on splash shield removal for more info. I will describe that method in this tech article. Start by removing the three 13mm fasteners at the front of the fuel tank splash shield (red arrows).

Next, move to the center of the splash shield, near the drive shaft.
Figure 2

Next, move to the center of the splash shield, near the drive shaft. Remove the four 13mm fasteners (red arrows). The inset shows a closer view of the two near the center support bearing.

Working at the rear of the splash shield, remove the two 8mm heat shield fasteners (red arrows).
Figure 3

Working at the rear of the splash shield, remove the two 8mm heat shield fasteners (red arrows). Next, remove the two splash shield fasteners (green arrow), you will be removing a 13mm fastener behind the plastic cover (blue arrow). The inset shows a close up of the 13mm fastener hidden behind the plastic cover.

Move to the rear of the splash shield, remove the 13mm fastener just above the rear subframe (red arrow).
Figure 4

Move to the rear of the splash shield, remove the 13mm fastener just above the rear subframe (red arrow).

Now to the left side of the splash shield, remove the three 8mm fasteners (red arrows).
Figure 5

Now to the left side of the splash shield, remove the three 8mm fasteners (red arrows).

With all the fasteners removed, pull the splash shield toward the center of the vehicle, then down.
Figure 6

With all the fasteners removed, pull the splash shield toward the center of the vehicle, then down. Let it hang (green arrow), you now have access to the charcoal canister (red arrow).

Working at the side of the charcoal canister, disconnect the three hoses (red arrows).
Figure 7

Working at the side of the charcoal canister, disconnect the three hoses (red arrows). Squeeze the hose release collar (inset), then pull the hose straight off the charcoal canister.

Next up, remove the three 10mm charcoal canister fasteners.
Figure 8

Next up, remove the three 10mm charcoal canister fasteners. There are two, one at the front (red arrow) and on in same spot in the rear. There is one on the left side as well (green arrows). When removing these fasteners, support the canister while you remove the last one. The canister can drop out. If it hits the ground it could break.

Slowly lower and guide the charcoal canister out of the rear fender and remove it from the vehicle.
Figure 9

Slowly lower and guide the charcoal canister out of the rear fender and remove it from the vehicle. Double check that you are getting one with the new part and be sure to replace it when installing the new part. Before reassembling the charcoal canister, inspect the canister lines and hoses for cracks or damage. You don't want to reinstall a defective part. Your check engine light will be on soon after if you do.

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Page last updated: Wed 12/7/2016 02:44:53 AM