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[Sir Tigger KC]

When I take the fuelcap off it hisses as a vacuum has built up.  It's got much worse today though.....

I'm going along quite nicely, when it splutters like it's out of fuel, but there's plenty.  So I stop, have a look and there's fuel leaking out the back!! I loosened off the fuel cap and fuel sprayed out!!    There was a massive vacuum built up in the tank and I could hear things relaxing as the pressure was released...

It must be a blocked breather, but I don't know where to start!  There's a nozzle just in side the fuel pipe that can be wiggled!!

Any ideas?? 

[millwall]

has it got the right fuel cap on it

[Sir Tigger KC]

I think so...    I tried it with the cap loose and it still peed petrol out!! 

[henryd]

When I take the fuelcap off it hisses as a vacuum has built up.  It's got much worse today though.....

I'm going along quite nicely, when it splutters like it's out of fuel, but there's plenty.  So I stop, have a look and there's fuel leaking out the back!! I loosened off the fuel cap and fuel sprayed out!!    There was a massive vacuum built up in the tank and I could hear things relaxing as the pressure was released...

It must be a blocked breather, but I don't know where to start!  There's a nozzle just in side the fuel pipe that can be wiggled!!

Any ideas?? 

If fuel sprayed out then its not a vacumn that you have 

[Lazydocker]

As you say, it's a blocked breather/vent. Not sure what age of Golf but normally attaches high up on the tank, sometimes near the pump/sender. May well be a corrugated plastic pipe

[millwall]

taken from a vw forum a bloke on there has same problem and this cured it

There is a "breather" tube which vents behind the plastic liner in the rear offside wheelarch. You need to remove the liner, easy job provided you have the "Torx" attachments for a screwdriver. Locate the tube and ensure it is not kinked, you can use a straightened out metal coater hanger to poke out any dirt. That should sort the matter out.

[Sir Tigger KC]

Thanks Millwall!!    I'll have a look at that!! 

[millwall]

if no joy with that tigger i will ask a vw mechanic that lives up the road

[Sir Tigger KC]

Thanks Millwall.  I found another thread on the ClubGTI forum where two pipes were connected incorrectly into the purge canister.... It's abit vague tho...

The symptoms are exactly the same.  I let it tick over today with the fuel cap off and fuel started welling up the pipe till it was spilling out!! 

[Sir Tigger KC]

Problem solved!!    It was indeed 2 pipes wrongly connected at the carbon canister!! Switched them round and job done, Happy days!! 

[Darth Loo-knee]

Problem solved!!    It was indeed 2 pipes wrongly connected at the carbon canister!! Switched them round and job done, Happy days!! 

Great result well done 
Enjoy it now