andy tit 1.6 tdci Posted March 25, 2012 Share Posted March 25, 2012 when ever i do a longish run , few miles or so my filler cap pops ? like a pop pop pop pop sound , anyone else notised this ? also when i go to clean around where the filler cap i see fuel mix ( or what i belive is fuel ) with water , i mean whan i spray uner the arch it leaves a water with a fuel stream down my drive , ok i may have some over spill now and then , but every time i clean the car ? should i worry about it been a fuel leak ? Quote Link to comment Share on other sites More sharing options...
Danny87 Posted March 25, 2012 Share Posted March 25, 2012 Don't worry about the popping as it's due to the vacuum inside the fuel tank. They are vented but there's still quite a strong vacuum as when you use the fuel in the tank air has to replace the space if that makes sense. I filled my car up again yesterday as I hadn't since I did a longish drive to Bristol visiting family, took the filler cap off and there was quite a vacuum holding it in lol. As far as the possible leak goes you may have a leak from the tube which goes down to the fuel tank, but then again if there were a fuel leak even that bad it probably wouldn't pop because the vacuum wouldn't be as bad. Best advice I can give you that side of things is to have a look underneath the car when you haven't washed it to see if you can trace any leaks. It's probably not a fuel leak as even a slight one you'd smell it probably even inside the car and definitely when it's parked up. Plus you'd notice a decrease in fuel economy but then again it depends where it's leaking from. Quote Link to comment Share on other sites More sharing options...
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