Yes - this was my exact thinking, but when told by the garage i had no reason to disagree at the time - vacuum which isnt quite strong enough to open the vent But it was certainly the sun which started it to leak again, it warmed everything up and it created the positive pressure instead, as we...

Yes there is a lot of sense here, your proberbly right and i agree, i dont think it was a waste to change the tank at all and now i have a good tank its showing a different fault, which was possibly there all along - or the changing of the tank itself could of upset something new as previously...

Yes, as implied by using the word "blows" I think if you read the posts correctly you will see that this has been covered, and is in fact all that the "vented" bit does of the vented fuel cap. Yes this is all a known many thanks Fuel cap Yes, i have the black vented version, if i...

yes of course, and after you have filled the tank and put the cap back on it will be de-pressurised and still starts - this i understand but i have a list of things to try so i can find the fault, including checking filters etc, but im really after some concrete answers about the cap drilling...

yes having the cap off makes no difference to starting it now, as its had a hole drilled in it anyway - however, im tempted to block it again and let it pressurise again to really prove that once and for all These two issues were never there before the tank was changed and the hole drilled, so...

Yes, this i show my 200TDI worked, but on this 300 i see the breather is connected back into the top of the fuel filler pipe, unless there is another breather in the engine bay And this is confirmed when you look at the workshop manuals So the cap blocks that off too, but allows it to breath...

If you take it apart you will see that there is a ball held in by a spring which can only be "sucked" open and not blown open

Hi all, Im seeking clarification on what seems to be a strongly divided topic! The 300TDI fuel fee system.... The facts as i know them 1) The cap is vented, but only in a vacuum environment, ie, it can only suck air in to replace the diesel that which has been drawn - not allow any pressure...