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TDI Fuel Economy Discussions about increasing the fuel economy of your TDI engine. Non TDI related postings will be moved or removed.

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Old February 18th, 2010, 14:41   #1
jimbobb2
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Default Fuel tank size?????

I see a lot of people posting 16+ gallon fill ups in the late model Jettas. My book says the tank holds 14.5 gallons. How are you getting another gallon and a half or more than full in the tank? I know you vent it and the filler neck is worth some, but surely not that much. Maybe I dont have enough guts to run it down that low?
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Old February 18th, 2010, 14:45   #2
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search function is your friend.

But since I'm already typing here, yes, the filler neck IS that large. Somewhere between 1.5 and 2 gallons, if you've done the ventectomy. Very handy having that much more fuel on board.
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Old February 18th, 2010, 15:01   #3
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Do you think maybe that it is a gasoline tank used for diesel? Maybe it is not the filler neck so much as the provisions for evaporative emission controls?
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Old February 18th, 2010, 15:11   #4
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New TDIs do not have a vent, therefore a ventectomy is no longer an option. I'm not certain exactly what year this change occured, but I do know that on 2009+ cars you cannot do a ventectomy. The most fuel I've ever put into my '09 is 14.1 gallone (US) and I would have filled up sooner if I found a station selling diesel fuel sooner.
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Old February 18th, 2010, 15:42   #5
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The 99.6-2005 Jetta and Golf, as well as the 98-2006 New Beetle, use the A4 chassis, and those did use the same fuel tank as the gas models used. On the diesels, the filler neck vent is useless since diesel fuel doesn't expand and vaporise like gasoline does. You can take the guts out of the vent housing, and it helps to use the full volume of the tank better, which is actually about 17 gallons. The reason it was rated at 14.5 was to allow for expansion of the liquid fuel.
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Old February 19th, 2010, 13:22   #6
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Quote:
Originally Posted by Plus 3 Golfer
So, I'd say one would be lucky to squeeze a few tenth of a gallon over the 14.5 gallons stated capacity by filling up to the brim of the filler neck.
I have put 14.5 gallons (54.8L) into my tank going a few inches down from the top of the filler neck without pushing it at all. Several times, I have easily gone between 14 and 14.5 gallons.
I suspect the tank can hold close to 15 gallons (57L) to the top of the filler neck.

The most I have pushed it was 107 mi (172km) past the low fuel light. I filled 10L and drove another 30km before I filled the entire tank.
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Old February 19th, 2010, 14:32   #7
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The '09's have a vent, it's just permanently open. Fuel tanks have to be vented, otherwise you'd be creating a vacuum as you drive along and consume fuel.
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Old February 20th, 2010, 12:59   #8
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Quote:
Originally Posted by lovemybug
The 99.6-2005 Jetta and Golf, as well as the 98-2006 New Beetle, use the A4 chassis, and those did use the same fuel tank as the gas models used. On the diesels, the filler neck vent is useless since diesel fuel doesn't expand and vaporise like gasoline does. You can take the guts out of the vent housing, and it helps to use the full volume of the tank better, which is actually about 17 gallons. The reason it was rated at 14.5 was to allow for expansion of the liquid fuel.
I have an ALS MKIV. How do I take the "guts" out of the vent tank?
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Old February 20th, 2010, 15:12   #9
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Quote:
Originally Posted by Qship
I have an ALS MKIV. How do I take the "guts" out of the vent tank?
Looks in the How-To's at the top of the 101 section.

What's an ALS? Do you mean ALH?
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Old February 20th, 2010, 19:59   #10
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I love the range of my 01 Golf. If the fuel tank were much larger, they'd have made refulling part of the service interval maintenance. lol!
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Old February 22nd, 2010, 16:14   #11
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Quote:
Originally Posted by MayorDJQ
Looks in the How-To's at the top of the 101 section.

What's an ALS? Do you mean ALH?

Yes, ALH (typo). Found the how to, and performed the extraction.
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Old February 22nd, 2010, 20:25   #12
lovemybug
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You should find it easier to top off your tank now that you have the vent guts taken out.

It will also help for being more consistent on your fill-ups for tracking fuel mileage.
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Old July 25th, 2010, 19:23   #13
analogue_nut
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Default 2010 tdi gas tank

Greetings - my wife and I just bought a '10 TDI Sportwagon, so I'm still learning where all the fuel stops are in around the Wichita, KS area. While running errands at lunch last week I almost ran it down to nothing. My range was shown at 5 miles, when I finally spotted the friendly green diesel sign about 2 blocks away. It took 14.67 gallons to fill it up. Don't want to repeat that any time soon!!!
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