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Evaporative Emissions Leak Detection Pump Replacement
 
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Pelican Technical Article:

Evaporative Emissions Leak Detection Pump Replacement

Jared Fenton

Time:

2 hours2 hrs

Tab:

$390

Talent:

***

Tools:

Floor jack and jackstands

Applicable Models:

Audi A6 (1997-04)
Audi A6 Quattro (1997-04)

Parts Required:

Evaporative Emissions Leak Detection Pump

Hot Tip:

Clean the inside of the wheel well prior to beginning

Performance Gain:

No more check engine light

Complementary Modification:

Inspect rear brake pads

The Evaporative Emissions Leak Detection Pump, or simply evap pump, can be a source of frustration in cars with higher miles. This pump is used to check the evap system for leaks which prevent the emissions system from functioning correctly. Due to its location behind the rear wheels, under the wheel liner, it can be affected by the elements as well as physical damage. This typically results in a fault code that can be intermittent. In my experience, it usually triggers right when you are getting an emissions check, resulting in a failed test.

Replacing the pump is pretty easy, although it does require you to jack up the car and remove the right rear wheel (looking towards engine). You'll also need to remove the rear wheel and wheel liner. See our articles on Jacking Up Your C5 Audi A6 and Rear Wheel Liner Removal for more information. Note that right and left is determined by looking towards the engine from the front.

The evap pump (green arrow) is located in the right rear wheel well behind the wheel liner.
Figure 1

The evap pump (green arrow) is located in the right rear wheel well behind the wheel liner. Jack up the rear of the car and remove the wheel and wheel liner. See our articles on Jacking Up Your C5 Audi A6 and Rear Wheel Liner Removal for more information.

Loosen and remove the three 10mm nuts (green arrows) securing the evap pump to the inside of the wheel well.
Figure 2

Loosen and remove the three 10mm nuts (green arrows) securing the evap pump to the inside of the wheel well.

Rotate the evap pump to access the electrical and hose connections.
Figure 3

Rotate the evap pump to access the electrical and hose connections. Press the tab on the electrical connector with a small screwdriver and pull it off the pump. Press the two yellow tabs (purple arrow) on either side of the hose connector and pull it off.

Cut the hose clamp (green arrow) holding the remaining hose connection to the evap pump.
Figure 4

Cut the hose clamp (green arrow) holding the remaining hose connection to the evap pump. Pull the air line off the connector.

And here's the finished result with the evap pump removed.
Figure 5

And here's the finished result with the evap pump removed. Installing the new evap pump is the reverse order of removal.

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Page last updated: Sun 11/19/2017 03:09:58 AM