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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW Passat Family (NMS and B7) TDIs (2012+)

VW Passat Family (NMS and B7) TDIs (2012+) Discussion area for the 2012+ Passat TDI (North American and rest of world versions versions). The North American model was previously codenamed NMS (New Midsize Sedan) and the version the rest of the world gets is sometimes referred to as B7.

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Old June 23rd, 2017, 07:40   #16
ZippyNH
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Originally Posted by Flyboy777 View Post
I have found the same thing. Nose up helps. When I first got the car I'd fill it up to the first click off and stop but it bugged me that the gas gauge was down an 1/8 from full right from the start. Then I tried a REALLY slow gentle fill and I was able fill it till full on the gauge with it full right up to the top of the neck. That was good as it extended the range to say 1300km but it took a really really long time to fill. Now I fast fill it to the first click off and pause to let the foam die down then fill with really short clicks till the neck is brimming. At 0 range on the MFI readout the most I have ever put in the 70 litre tank is 67 and more usually it is 62 to 65 litres. As far as I can tell 0 range is just as the manual states there is probably a 6- 7 litre reserve which translates to an additional 150 km of range. I don't sweat the 0 range because I know I this. Of course driving into that range raises the spectre of eventually drawing air into the system so probably good to not go to far past 0 range. That way there is enough fuel in the bottom of the tank to keep the pickup covered.
How much lubrication does foaming fuel provide to a hpfp?
Not much. Air is terrible lube...
I'm don't go too low.
I refuel when the low fuel light comes on... sometimes sooner if cheap or I have time.
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Old June 23rd, 2017, 22:04   #17
tdiatlast
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Originally Posted by ZippyNH View Post
How much lubrication does foaming fuel provide to a hpfp?
Not much. Air is terrible lube...
I'm don't go too low.
I refuel when the low fuel light comes on... sometimes sooner if cheap or I have time.
I suspect that this is the most valuable post in this thread.

With all the fuel circulating, at a rapid rate (?), I'll bet there is substantial foaming of fuel when the tank gets near empty.

Total speculation on my part, but my OCD analysis of such things tells me I'm right. HAHA!
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Old June 23rd, 2017, 23:29   #18
BKmetz
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In my experience the NMS Passat is as easy to top off than the older models that had the vent valve in the filler neck removed. For those that have one, the nozzle restrictor has not had any effect in filling the fuel tank up to the brim.

I do routinely top off my car up to the the very top of the filler neck. I have kept mileage logs since my first tank with my first TDI, my beloved 97 Passat.

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Old June 25th, 2017, 12:47   #19
compu_85
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And how does that make your world and your life better? It's just OCD and they do have medication for that.
Whenever I fill the cars I always fill "to the brim" - as 'dub noted, how else will you get an accurate fuel economy calculation?

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Maybe I should pay MYSELF to do bad work on my car!
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Old June 26th, 2017, 05:14   #20
740GLE
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On the Alltrack I've given up tracking MPG tank per tank as it has the evap system and don't want to brim it.

A piece of me is missing each time I fill up, knowing that I'm not getting an accurate fill to calculate actual miles/gallon.
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Old June 26th, 2017, 06:38   #21
compu_85
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Gasoline is different... it doesn't foam up like diesel, so waiting for the pump to click off is a much more consistent measurement.
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Old June 26th, 2017, 10:52   #22
jaydhall
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MICKEY! I have missed youse!
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Old June 28th, 2017, 05:34   #23
740GLE
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Originally Posted by compu_85 View Post
Gasoline is different... it doesn't foam up like diesel, so waiting for the pump to click off is a much more consistent measurement.
Yeah but it clicks off, but I know there's still room!
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