Vacuum in fuel tank - Club Touareg Forums
 
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post #1 of 9 Old 09-01-2015 Thread Starter
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Vacuum in fuel tank

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
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post #2 of 9 Old 09-01-2015
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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?
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post #3 of 9 Old 09-01-2015 Thread Starter
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I have the car for 4 months now and I refuel twice a month.
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post #4 of 9 Old 09-02-2015
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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.
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post #5 of 9 Old 09-02-2015
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Quote:
Originally Posted by N_Jay View Post
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!!
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post #6 of 9 Old 09-02-2015
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It's probably a diesel so unlikely to have the charcoal canister - but blocked breather would still be the likely culprit.

2015 (16MY) Touareg SE 258 bhp
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post #7 of 9 Old 09-02-2015
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Quote:
Originally Posted by noobytoogy View Post
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.
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post #8 of 9 Old 09-02-2015
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Quote:
Originally Posted by Black Grouse View Post
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?
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post #9 of 9 Old 09-02-2015
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He has a 2.5 Tdi [and has selected the wrong model next to his user name!].
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