DIY: Gas tank problems Evap Canister Leak Detection pump (2024)

Assume at your own risk, I'm writing this DIY with information that I have learned from the internet and have tried on my own car, I am not saying I am right and this is the solution to your problems but hopefully it can help a few people

Disclaimer: I assume no responsibility whatsoever for damages that
an end user may inflict upon their vehicles or themselves
using information contained herein. Proceed with caution and care
when performing modifications to your vehicle. Be advised
that making modifications to your vehicle may void your manufacturer's warranty and may not be legal for road use depending on your location.

Evap canister & Leak Detection pump Replacement DIY

Lets get a better understanding of what exactly our evap system is.
It consists of:

Leak Detection pump
Evap Canister
n80 purge valve

The Breakdown

The evap system is pretty much a big circle between engine and gas tank that cycles vapors. When filling gas, your tank vents through the evap charcoal canister and then out the Leak detection pump's paper filter. The leak detection pump is then connected to the vacuum reservoir located in the front drivers fender and then comes out under the power steering resevoir and then connects to the F shaped hose under the intake manifold. on the other side of the engine you have the n80 valve which is the purge regulation valve for the gas tank, one side goes to the charcoal canister and the other side goes off into a Y, one part of the Y goes to the Turbo Inlet pipe and the other part goes to the F shaped hose under the intake manifold. While the cars running the Leak Detection Pump will not vent the gas tank into the atmosphere it will cycle it back into the engine via the n80 valves readings.
Here is a diagram

1-Evap canister – Located underneath spare tire well; accessed from under the back of the vehicle click for picture
28- Line coming from gas Tank
28- Line going to n80 valve
35,18,15- Lines going to LDP

up to 2003 part # 8E0-201-801A $240.00 CAD
2004 and on part #8E0-201-801L $164.00 CAD

Replacement of the Evap canister

Remove the 10mm nuts(3) and drop the cover down. (4)
Remove 1time use hose clamp(14 in the diagram) and remove hose going to LDP
Follow instructions written on evap canister(1) on how to remove the hard lines (28). One is big with a blue seal and one is small with a red seal, use a screw driver to push in the seal ring and then jiggle out the hoses, careful not to break them!!! It may seem like they are not coming, make sure the seal things are pushed in all the way and just keep jiggling it this is normal.
Remove the 3 bolts holding in the Evap canister (2)
Switch evap canisters, screw it in (1) (check weight of your canister, heavy canisters will be clogged with fuel making it more likely this is your problem
Reattach hard lines & pull out clip things but first MAKE SURE TO CHECK THAT LINES AREN'T CLOGGED WITH CHARCOAL SOOT.(28)
Replace 1time use clamp with screw clamp and reconnect soft hose (35)

*disclaimer: this may or may not be legal for road use depending on you local laws. By continuing to follow this DIY, you hereby assume all risk associated. I will not be held liable or accountable for your actions, mistakes or penalties **

Delete the Evap Canister Thanks @capt.obvious and @kneel for the pictures
*ASSUME AT YOUR OWN RISK. PLEASE SEE DISCLAIMER*

common symptoms are,

check engine light p0441
unable to fill gas at more than $3 at a time due to excess pressure build up in my tank,
(upon removal of nozzle one would hear a "psssshhh" coming from the filler hole)
caused because while filling, the tank vents thought the n80 and the evap canister and out the LDP so something was clogged in between there.
poor gas milage

after checking all the hoses, and replacing the n80 valve and still not being able to fill up you can come to the conclusion that your EVAP canister is clogged.

By doing this you should successfully turn off your check engine light and be able to fill up gas fully!

Materials Required
- T fitting with two 3/4th" openings and one 1/2" opening ( or as mentioned by heyweir427 5/8 and 3/8 inside diameter )
- 1 foot 3/4 inch hose
- 1 foot 1/2 inch hose
- 2 medium sized hose clamps for the 1/2inch
- 4 hose clamps for the 3/4inch
- 13 mm wrench
- 10 mm socket

Remove the 10mm nuts(3) and drop the cover down. (4)
Remove 1time use hose clamp(14 in the diagram) and remove hose going to LDP
Follow instructions written on evap canister(1) on how to remove the hard lines (28). One is big with a blue seal and one is small with a red seal, use a screw driver to push in the seal ring and then jiggle out the hoses, careful not to break them!!! It may seem like they are not coming, make sure the seal things are pushed in all the way and just keep jiggling it this is normal.
Remove the 3 bolts holding in the Evap canister (2)
with your T fitting attach 3/4inch (28) &(18) hoses together at the sides of the T and 1/2inch to the bottom of the T (28)
Tighten hose clamps on T-fitting
Replace Nuts and cover(3)(4) You may need to add a spacer in between where the canister was
Go try and get gas and come back and give me, kneel and capt. obvious + rep if it does ! lol

5 – Leak Detection Pump – Located in the driver side wheel well. click for pic

Revised to 8E0-906-201K $166 USD
From 8E0-906-201J and 8E0-906-201C

9- Paper filter your gas tank vents through while filling.
24- Vacuum canister – located inside driver side front fender

Replacement of LDP

Remove Drivers rear wheel
Remove carpet wheel liner and you will see the LDP up top
Remove 2 nuts on the top and 1 hidden on the side (12)
Remove wire at the top and pull the LDP out as far as you can so its easier to work with.
Remove hard tube (15) its impossible to push in those yellow clips imo so i took of the clamp
Remove Small hose going to Vapor Canister(24) it should go psshh when you do this.
Replace old pump with new one, change over paper filters if needed.
Follow steps 1-7 backwards except replace the words Remove with Install

N80 Valve is located under your hood.
info on vac lines and evap lines under the hood can be found here by a4darkness another great DIY