Good idea to keep tank full ?

mxtdiguy

Veteran Member
Joined
Oct 17, 2017
Location
Mexico
TDI
'16 sportwagen TDI sel 6mt
Less air in the tank means less chance for water condensation, the enemy of diesels ?
 

mxtdiguy

Veteran Member
Joined
Oct 17, 2017
Location
Mexico
TDI
'16 sportwagen TDI sel 6mt
Buy a second car and drive it, in the meantime park your TDI and admire it sitting with your full tank of fuel:mad::eek::confused::rolleyes:
oke dokey, thanks for the insightful tip

Maybe I should have phrased the question as " Is it a good idea to keep the tank fuller rather than not to reduce the volume of air ?" or is condensation inside the tank an non issue ?
 
Last edited:

C C

Well-known member
Joined
May 23, 2015
Location
USA
TDI
GSW
Thanks to widespread restrictions on volatile hydrocarbons, condensation has become uncommon. You're likely to get water from contaminated fuel instead.

Fuel is the heat sink that keeps expensive high pressure fuel pumps running cool. Thus, I fill my vehicles around 1/2 tank.
 

GreenLantern_TDI

Veteran Member
Joined
Feb 27, 2014
Location
Iowa
TDI
2015 GOLF SEL
I tell everyone during winter keep tank over half. Keep tank topped off. Ya never know if you may become standed and need to idle to stay alive until rescue or circustances change.
 

pdq import repair

Veteran Member
Joined
Nov 6, 2016
Location
idaho
TDI
09 Jetta
^^^
Best reason there, especially in snow states. I have been stranded for only as long as a couple hours one time. Luckily it was in traffic and waiting for wreck clearing (not mine) with others around. There are places along my daily commute where I could blow far enough off the road to not be seen, or stuck in a whiteout blizzard, or something like that. Good to have fuel for heat at least.


As far as condensation goes, it is possible in a diesel as they do not have the evaporative emissions sealed systems like gas cars, but it is still not even a concern on my part. I do go through fuel faster than some so I fuel up weekly anyway.


Biggest fears and effects from condensation in the past was tank rust internally, but today's tanks are plastic, so no problem there either.
 

Mike in Anchorage

Veteran Member
Joined
Jan 4, 2009
Location
Anchorage, AK
TDI
2016 Touareg Lux, 2015 Golf Sportwagen SE, new 4 Sept 2017;2009 VW Jetta TDI Sportwagen (Ruby) sold to VW on 22 SEP 2017
I don't practice what I preach, but after the shaky here last week, the lines at the stations were really long. Fortunately, power stayed on for most places, so the pumps worked. I run my car until the fuel level alarm shows <50 miles remaining.
 

740GLE

Top Post Dawg
Joined
Aug 19, 2009
Location
NH
TDI
2015 Passat SEL, 2017 Alltrack SE; BB 2010 Sedan Man; 2012 Passat,
I'd be more worried about having proper gel point of the fuel than condensation.

IN the western mountains of Maine, my father in law needed a tow this past Saturday morning in his '18 Duramax, local fueling place gel point must have been -10F. Friday night it dropped to -13F at his camp (only 40 miles away) he made it 3/4 of the way home before he had to call for tow and place the truck in a garage with some PS 911.

Needless to say I'm going to be giving him a big jug of PS white for xmas.
 
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