I know that the fuel tank is usually under pressure and that when you remove the petrol cap you can hear some air being sucked in, but since the weekend I seem to have a problem with excessive pressure in the fuel tank to the point that the fuel pump starts to act up causing the car to stutter and making it almost impossible to drive.If you then open the fuel cap you can hear a serious amount of air being sucked in and the car runs perfectly after that until the "excess" pressure builds up again after about 150-200 kms.

 

:confused:

 

anyone got any ideas what could be causing this ?

Is there a vent which is blocked ? Have you tried running the car without the fuel cap (or perhaps one of those temporary plastic ones which wouldn't be so air tight) ?

Andy, I wouldn´t know which "vent"you are refering to mate. Do you mean the breather pipe running from the tank to the neck of the petrol cap ?..are there more "vents" to allow pressure release from the tank or am I totally on the wrong track ?

 

as for running without a fuel cap or using a cheap /not so tight one, haven´t tried that yet, will give it a go though if all else fails

 

cheers

 

:)

I'm not sure, but there must be some type of vent otherwise (barring leaks) there would be huge vacuum in the tank. Isn't there a little one-way valve in the filler cap ? I seem to recollect some holes there, but I may be thinking of another cap - I've not looked at mine for a while !!

Look in the online manual at page 192 of EF&EC section and it shows what to do I think.

 

You can t the manual from here.

 

http://www.4shared.com/account/dir/4107095/1f71aa4a/sharing.html?rnd=33

 

Good luck with it.

 

Darrell