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| D2 - Fuel and Exhausts Everything to do with getting fuel into the engine, and fumes back out again |
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#1
2nd June 2010, 06:07 PM
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Overflowing petrol
I filled my tank today and then drove the short distance home. Car was parked up for about 45 mins and then I moved it to let my wife on the drive. When I got out there was fuel on the road and running from somewhere up the top of the tank. I only lost about half a litre but it looked to be quite a free flowing leak.
Does anyone know the likely area/cause? I'm guessing the fuel expanded after coming from the cooler underground tank to the warmer environment, but I wouldn't expect it to overflow like this. 
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#2
2nd June 2010, 06:58 PM
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Have you checked the banjo bolts on your fuel filter. When mine failed it was quite messy.
__________________
Conan (the Librarian) Watch it if you dare Currently, 2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block. 1997 4.2 A8SQ - the Projekt. 12 years and ongoing! 1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard 2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion. 2005 C5 Allroad 2.5TDi FE - Grey - Workhorse. 2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter. Previously 2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex 1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure. 1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex. 2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on. 1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8. And a list of non VAG going back 40 years before I saw the light. 
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#3
3rd June 2010, 12:13 PM
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No fuel leaking this morning or after the drive into work. Am I right in thinking that if it were the fuel filtre banjo bolts I would get some leakage every time the fuel pump ran?
I seem to remember seeing on a drawing somewhere reference to an expansion tank. Is this easy to get to to check for leaks, missing hoses etc?
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#4
3rd June 2010, 01:25 PM
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Dunno about the expansion tank, but if there is no leaks now then it probably isn't the fuel filter banjo bolts.
__________________
Conan (the Librarian) Watch it if you dare Currently, 2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block. 1997 4.2 A8SQ - the Projekt. 12 years and ongoing! 1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard 2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion. 2005 C5 Allroad 2.5TDi FE - Grey - Workhorse. 2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter. Previously 2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex 1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure. 1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex. 2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on. 1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8. And a list of non VAG going back 40 years before I saw the light.
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#5
3rd June 2010, 01:35 PM
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Just had a quick peek at ETKA, this is what you are on about I think,
There is indeed pipework from and to the main tank and what looks like an overflow.
__________________
Conan (the Librarian) Watch it if you dare Currently, 2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block. 1997 4.2 A8SQ - the Projekt. 12 years and ongoing! 1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard 2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion. 2005 C5 Allroad 2.5TDi FE - Grey - Workhorse. 2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter. Previously 2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex 1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure. 1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex. 2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on. 1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8. And a list of non VAG going back 40 years before I saw the light.
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#6
24th June 2010, 06:12 AM
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It would appear it is not the expansion tank or any of the associated piping, but it looks like it probably came from the fuel sender cap. When I bought my car the fuel gauge was very inaccurate, in fact I ran out of petrol while reading 1/4 tank (not even in the red) and from missing screws and the like it looks like someone had been looking at the sender.
I have fixed the gauge by use of the calibration figures VAG Com however the wake of the previous work would appear to be that the fuel sender cap was never done up properly and was not sealed. It just popped off with very little persuasion. I have tried tightening it up but it seems virtually impossible without the correct tool, does anyone know a good source for the Audi 2012A fuel sender removal tool.
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