Club Touareg Forums

Club Touareg Forums (https://www.clubtouareg.com/forums/)
-   ClubTouareg.com Site Issues & Website Help (https://www.clubtouareg.com/forums/f100/)
-   -   Vacuum in fuel tank (https://www.clubtouareg.com/forums/f100/vacuum-in-fuel-tank-214873.html)

Karwan 09-01-2015 03:17 PM

Vacuum in fuel tank
 
1 Attachment(s)
Every time when I try to undo the fuel cap a lot of air rush into the tank I mean a lot and fast for about 3 to 4 seconds . Is this a problem or something is blocked there . Thanks

N_Jay 09-01-2015 04:40 PM

Usually that is a sign of a clogged charcoal canister.

Could be a stuck emission vacume valve also, but in general those leak.

How long have you have the truck?

How often do you top up when getting gas?

Karwan 09-01-2015 11:33 PM

1 Attachment(s)
I have the car for 4 months now and I refuel twice a month.

N_Jay 09-02-2015 08:15 AM

No check engine (MIL) light?

Guessing the previous owner had a habit of topping up (Adding more fuel after the nozzle cuts off).

You can try driving it a while and see if it gets better or worse.
I would avoid filling it all the way to the top and see if whatever is clogged open up.

An illegal fix would be cutting a vent line, and installing a "T" and adding a small vent on the "T".
Probably a small engine fuel filter capped off with a few pinholes in the cap would work.
It might trip a MIL showing an vacuum leak, so be ready to undo it.
Or get a new charcoal canister and hope that is it before chasing down a bad vent/purge valve.

I had an old Triumph (GT6) do this and the vacuum created pulled in the sides of the fuel tank. I first noticed it when I had fuel supply problems when racing.

noobytoogy 09-02-2015 09:41 AM

Quote:

Originally Posted by N_Jay (Post 1289153)
I had an old Triumph (GT6) .

My second job was selling those new from a Rover Triumph dealership!

We had a bright yellow one in stock for ages!!

Black Grouse 09-02-2015 09:46 AM

It's probably a diesel so unlikely to have the charcoal canister - but blocked breather would still be the likely culprit.

N_Jay 09-02-2015 10:02 AM

Quote:

Originally Posted by noobytoogy (Post 1289233)
My second job was selling those new from a Rover Triumph dealership!

We had a bright yellow one in stock for ages!!

Off topic drift . . . .

Mine was "pimento", that wonderful red-orange that refused to hold a coat of wax.

Fun car to drive, and never short of odd things to fix.

N_Jay 09-02-2015 10:05 AM

Quote:

Originally Posted by Black Grouse (Post 1289257)
It's probably a diesel so unlikely to have the charcoal canister - but blocked breather would still be the likely culprit.

Didn't think Diesel.

I am not familiar with the fuel system venting on a diesel.

Is there an electrically or mechanically operated vent valve?
Or is it vented in the intake system somewhere?
Will it trip an error code if the tank is vented?

noobytoogy 09-02-2015 02:49 PM

He has a 2.5 Tdi [and has selected the wrong model next to his user name!].


All times are GMT -6. The time now is 07:36 AM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.

 
For the best viewing experience please update your browser to Google Chrome
 

VW Touareg News Delivered to your Email!

Stay up-to-date with Touareg news in your inbox.

unsusbcribe at anytime with one click

Close [X]