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Charcoal Canister and DMTL Pump Replacing
 
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Pelican Technical Article:

Charcoal Canister and DMTL Pump Replacing

Nick Czerula

Time:

3 hours3 hrs

Tab:

$400

Talent:

***

Tools:

Phillips screwdriver, 8mm 12mm sockets

Applicable Models:

X3 E83 (2004-06)
X3 E83 facelift (2007-10)

Parts Required:

Charcoal canister, DMTL pump

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 and DMTL pump are located at the right rear of the vehicle behind the wheel well liner. The charcoal canister is responsible for storing hydrocarbon vapors from the fuel tank that are eventually sent to the engine via the purge solenoid. The DMTL pump is mounted to the charcoal canister and is used to pressurize the evap system to check it for leaks. The DMTL pump can fail electrically. A fault code will be stored and the MIL (malfunction indicator lamp) will be illuminated. If you have a fault code for the DMTL pump current high, replace the DMTL pump with a new one.

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.

The charcoal canister and DMTL pump are located at the right rear of the vehicle behind the wheel well liner (red arrow).
Figure 1

The charcoal canister and DMTL pump are located at the right rear of the vehicle behind the wheel well liner (red arrow). The charcoal canister is responsible for storing hydrocarbon vapors from the fuel tank that are eventually sent to the engine via the purge solenoid. The DMTL pump is mounted to the charcoal canister and is used to pressurize the evap system to check it for leaks. The DMTL pump can fail electrically. A fault code will be stored and the MIL (malfunction indicator lamp) will be illuminated. If you have a fault code for the DMTL pump current high, replace the DMTL pump with a new one. Loosen the right rear wheel studs 1/4 turn. To begin, jack the rear of your vehicle and support it using jack stands. See our tech article on jacking your vehicle. Always wear your safety glasses whenever you're working under your car. Remove the right rear wheel.

You now have access to the charcoal canister (red arrow).
Figure 2

You now have access to the charcoal canister (red arrow). Working at the top of the filler neck, disconnect the hose (blue arrows).

Squeeze the hose release collar (red arrows) and pull the hose straight off the filler neck (inset).
Figure 3

Squeeze the hose release collar (red arrows) and pull the hose straight off the filler neck (inset).

Working at the top of the charcoal canister below the filler neck (blue arrow), Squeeze the hose release collar (red arrows) and pull the hose straight off the filler neck (inset).
Figure 4

Working at the top of the charcoal canister below the filler neck (blue arrow), Squeeze the hose release collar (red arrows) and pull the hose straight off the filler neck (inset).

Pull the harness off the charcoal canister by unclipping the mounts (blue arrows).
Figure 5

Pull the harness off the charcoal canister by unclipping the mounts (blue arrows). Then remove the two 10mm nuts (red arrows). When removing these canister mounts, support the canister while you remove the last one.

Remove the canister fastener side first and remove from the vehicle.
Figure 6

Remove the canister fastener side first and remove from the vehicle.

Place the canister on the ground.
Figure 7

Place the canister on the ground. The wiring harness should reach. Then, disconnect the DMTL pump electrical connector by pressing the release tab (inset) and pulling it straight off.

Then remove the three Phillips head screws (red arrows) for the DMTL pump.
Figure 8

Then remove the three Phillips head screws (red arrows) for the DMTL pump.

Pull the DMTL pump straight out of the charcoal canister to remove it.
Figure 9

Pull the DMTL pump straight out of the charcoal canister to remove it. The fresh air line is shown detached. The new DMTL pump should come with a seal. 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. Install the new DMTL pump to the charcoal canister. When installing the pump to canister, I find it helpful to apply dish soap to the rubber grommets to get them to slide on easier.

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Page last updated: Sun 5/28/2017 03:21:03 AM