Snapon Diagnostics Product Forums Diagnostic Home . Diagnostic Product Index . Customer Care        
Diagnostic SoftwareDiagnostic PlatformsAsk-a-Tech, Automotive Repair InformationTech Central
Go Back   Snapon Diagnostics Product Forums > Member General Discussion Forum > General Discussions > Evaporative (EVAP) Emissions Systems
Home Today's Posts Register Members List FAQ
Thank you for visiting Snap-on Diagnostics Product Forums.
You are currently NOT logged in to a registered account. Some functions of Snap-on Diagnostics Product Forums will not be available to you if your are not logged in as a registered member. For a limited time only, registrationto Snap-on Diagnostics Product Forums to Snap-on Diagnostics Product Forums is !! FREE !! Select the    **REGISTER NOW**    link to register for your FREE Snap-on Diagnostics Product Forums account!!

Thread Tools Display Modes
Old 07-15-2012, 06:40 PM
Trindaddy's Avatar
Trindaddy Trindaddy is offline
Senior Member
Join Date: Jan 2010
Location: New Hampshire
Posts: 337
Trindaddy Made it to level 2!  Looks like you are on your way to becoming famous

Default Repairing tank tip

Recently, I found a leak in an 03 Audi Avant Quattro fuel tank that turned out to be a cracked nipple on a valve that resides atop the tank (there are 3 or 4). After a little research i learned that Audi had a recall for many of these just for this problem. In the recall it describes how to reinforce and seal the nipple on one or two of these valves, but not all of them. Of course, the one they didn't do was broken. So, I ordered the stuff, borrowed the gun from my friends at the Audi dealer and made the fix. I was worried. I don't usually try fixes like this. It was not fun getting this tank out, but a new one was 1330.00! I saw that the Audi 2 part adhesive was obviously 3M DP8005, and the gun also a 3m part. The fix was cool. You basically build a wall around the valve with the provided barrier and weatherstrip and fill it with this stuff. It hardened and stuck to the tank unbelievably. I realize you could find this on your own but after doing this I realized how handy this stuff could be.
So, I ordered some more to keep on hand and bought the gun and mixing nozzles on ebay for under 40 bucks. The adhesive is cheaper through Audi than buying from 3M distributors! Anyway, I had a Saab with an evap leak the other day. I found the leak coming from under the tank pressure sensor. It is mounted near the pump module on a little pedestal that is sealed into the tank body, apparently cracked from the guy who just replaced the fuel pump. Its easily accessible from under the rear seat. This spelled disaster however, as Saab parts are getting scarce and very expensive. We handcrafted a little wall around the sensor base just higher than the pedestal it sits in out of cardboard and round weatherstrip goo. Out came the 3m gun and dp8005 structural adhesive! Of course that pressure sensor is NEVER coming out again, but what a nice fix. This stuff works on these black poly tanks! Finding this recall turned out to be a great thing. Now, i also bought some high quality epoxies that work in this gun too. For you guys that do this evap stuff, i think your gonna like this! Here's the recall and 3M link. Could bail you out big time if you break one like this yourself or be a hero when you fix the unobtainable tank, for good.

Audi reference# 20L8/JY revised January 2009
Reply With Quote
Old 07-16-2012, 09:33 AM
sandt38 sandt38 is offline
Senior Member
Join Date: May 2012
Location: NC
Posts: 187
sandt38 Made it to level 2!  Looks like you are on your way to becoming famous


I use the 3M stuff all the time. I get it from Napa relatively cheap. I use if for everything from gluing down dash pads on Grand-Ams that love to pop up, to gas tank repairs... I even used it to fix a broken MAF on my GN when my motor mount snapped. The housing broke in 2 after the sensor, but the sensor was OK. I have found it does not adhere to some surfaces, but I would say 95% of the time it provides a great fix.

1 note; I always pump out 1/2 a teaspoon or so on some cardboard before using it on the actual surface to be repaired as sometimes the 2 sides don't start at the same time.
Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -7. The time now is 12:50 AM.

Reminder: Your participation in these areas of the site is solely at your own risk. The
information is only the opinion of the poster, is no substitute for your own research,
and should not be relied upon for business critical decisions or any other purpose.
Never assume that you are anonymous and cannot be identified by your posts.
We reserve the right to discontinue any users' use of any such public forum
for any reason. Please read the Terms of Service.

Snap-on is a trademark, registered in the United States and other countries, of Snap-on Incorporated. Other marks are marks of their respective holders.
©2009 Snap-on Incorporated. All rights reserved.