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Fuel Tank Filler Neck

A few years ago mine started blowing back when filling up, I kept getting fobbed off at the OPC but it got worse and I kept on at them until finally one of their technicians came to a petrol station and as soon as I started pumping it into the tank more outside than in! It was fixed the next week in a morning so no more than 3 hours. I think the problem was down to an air bleed valve on top of the tank, they said it was difficult to reach as it needs a mechanic with a long, thin ( and probably double jointed ) arm! Probably why they didn't want to do it! Also probably one of those jobs that goes well or turns into a nightmare depending how the top fittings of the tank were installed in the factory and which way a clip or fitting is facing![:mad:] If this is what you're having a problem with good luck with getting them to fix it.
 
This is not the first time it's happened. It's has stemmed from when we got the car in April. We would fill it up and it would never register a full tank. Took photo's of the fuel gauge empty and full, even told them about of fuel put into tank. It went in so they could run tests. Was told fuel sensor was at faulty this was replaced (OPC manually filled tank up) . 2 weeks later same fault ran test after test (data sent to & from Germany), it was put down to fuel sender (OPC manually filled tank up). Few 2 weeks same fault- OPC had car in again (same as before more test (data sent to & from Germany)). This time clocks replaced, as not able to just replace fuel gauge section. Few 2 weeks same fault[:mad:][:mad:]. This time car in dealers for over a week. It was investigate further and found to be the filler neck was set to far into the tank. This was rectified and was fine. Only this little problem now[8|].
 
Hi, not had the issue on my Cayman R - had a similar issue some time back on a BMW turned out to be a kink in the filler neck that meant the nozzle didnt fit correctly and thus the auto cut-out on the nozzle kept triggering.......just a thought. Cheers, Colin
 
It has been reported at length on Planet 9. But nothing conclusive as it can be a kinked pipe, air bleed valve and maybe a couple of other things, possibly that they have to see how it is to analyse the exact cause. Whatever it seems to be a rare fault and isn't only the Cayman but will apply to 997 and Boxster 987.
 
Update: Email the Chief Mechanic at my local OPC & got this reply "When we fill any of our model range with fuel we would normally insert the nozzle just inside the filler neck, rather than fully inserting it in to the filler neck, this normally combats the problem of fuel coming back up the filler neck and shutting off the pump. Over the years and trial and error I have found this method to be the most effective and least frustrating way." When I fill up next I will let you if this has worked. Alun
 
That's the only way my Cayman fills and so did the Boxster before. Shoving the nozzle right in and squeezing the trigger to full flow has never worked. It will fill at the max flow for most pumps with the nozzle about one third to half-way in.
 
That's as mine was when I first got it but then it got more difficult until it was taking several minutes to fill the tank or even top up and then became intolerable.[:mad:] Ever since it was sorted in the workshop I can push the pump head fully into the pipe and pump to when the trigger stops it but I don't keep topping up after the foaming in the tank has subsided which was thought to be one possible cause by some on Planet 9.[:-]
 
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