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Go Back   TDIClub Forums > VW TDI Discussion Areas > Dieselgate - VW Group Emission Scandal

Dieselgate - VW Group Emission Scandal Discussion around the VW Dieselgate Emissions scandal. Details and news updates can be viewed here: http://forums.tdiclub.com/showthread.php?goto=newpost&t=448336 This forum is a work in progress depending on requirements, usage, etc.

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Old April 30th, 2017, 07:38   #16
Trade Wind
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Filters are cheap, I'd try that one more time. If it clears the problem again, that would strongly suggest contaminated fuel. Just my two cents, no first hand experience with your problem.
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Old April 30th, 2017, 09:31   #17
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You might want to start a thread somewhere where you can get visibility. An ALH question buried in a Dieselgate thread won't get many viewers.

My suspicion? An air leak. Lots of black smoke usually means plenty of fuel.
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Old May 1st, 2017, 04:41   #18
ecupip
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Should be fine. When I picked up my 2012 Jetta they hadn't changed the fuel filter in over 40,000 miles. Ran just fine, but it took about a 5MPG hit in economy.
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Old May 1st, 2017, 05:31   #19
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Quote:
Originally Posted by ecupip View Post
Should be fine. When I picked up my 2012 Jetta they hadn't changed the fuel filter in over 40,000 miles. Ran just fine, but it took about a 5MPG hit in economy.
And you think that the lack of a fuel filter change in 40K had something to do with a reduction in fuel efficiency? Why?
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Old May 1st, 2017, 11:27   #20
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Originally Posted by turbobrick240 View Post
If you have the new filter, change it out. You don't need vcds to fill the canister.
The only reason you use VCDS for changing the fuel filter is to purge the system of any air bubbles. Not sure if you can do the same trick as the Mk4 TDIs - basically, you turn the key to ACC (but don't actually crank the car), and then back off. Doing that turns on the fuel pump for a second or so to circulate the fuel. I do that about 30-35 times when changing the fuel filter on the Golf/Jetta; when I replaced the rubber fuel lines, I did it about 60 times to be safe. Car started right up without any problems (since we don't have a fuel pump VCDS option on the Mk4).
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Old May 1st, 2017, 11:31   #21
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Originally Posted by DanB36 View Post
The fuel filter on Dieselgatemobiles is not designed to act as a water separator, the way that the ALH fuel filter is.
I think you meant Mk4 - BEW and ALH engines both use the same fuel filter. In fact, all filters in the Mk4 are common between the two powertrains.
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2004 Golf GLS 5MT -
Malone Stage 4, VNT17, DC Stage 2 clutch, buzzken 2.5" straight pipe, MFA cluster swap, dieselgeek Panzer plate and short shifter, Bosal towbar, Tekonsha P3 brake controller, Hopkins short-proof trailer light converter, darkside SMIC, intake manifold, and tip pipe, PD150 airbox
2005 Jetta Wagon GLS (mom's car) - Malone Stage 4, VNT17, MFA cluster swap, Panzer Plate, buzzken 2.5" straight pipe, darkside SMIC
2015 Golf Sportwagen TDI (mom's car) - stock for now...

Other diesels:
Ford 5900 tractor
Ford 3400 Industrial tractor
2016 Mahindra XTV (1L Kohler diesel)
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Old May 1st, 2017, 14:27   #22
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Quote:
Originally Posted by pkhoury View Post
The only reason you use VCDS for changing the fuel filter is to purge the system of any air bubbles. Not sure if you can do the same trick as the Mk4 TDIs - basically, you turn the key to ACC (but don't actually crank the car), and then back off. Doing that turns on the fuel pump for a second or so to circulate the fuel. I do that about 30-35 times when changing the fuel filter on the Golf/Jetta; when I replaced the rubber fuel lines, I did it about 60 times to be safe. Car started right up without any problems (since we don't have a fuel pump VCDS option on the Mk4).
Yes, that's the idea. In reality, if the canister is full or nearly full, the system will self purge while running. If you were to watch techs at the dealerships doing fuel filters, I'd wager that 95%+ don't use any special priming. I don't believe the Bentley manual says anything about vcds priming in its fuel filter change procedure. In any case, I'm glad to have ditched my cp4 for the far superior cp3 pump.
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Old May 1st, 2017, 14:39   #23
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This has kind of been beat to death before,

but the 2009 and later do not operate the fuel pump (either in-tank, or intermediate electric pumps) when the start switch (not really an ignition switch) is placed in "on", and before starting.

the maintenance manual does not refer to the purge in the filter change procedure, but there is a very clear caution (to avoid vehicle damage) that says you should purge the air any time the system is opened between the tank and injector.

last time I looked, the fuel filter can would qualify.

the system does have some capacity to purge air during operation, but with the focus on HPFP, seems silly not to run the pumps if you have a VCDS.

no disrespect to folks who choose to fill and go, but this is my impression.
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Old May 1st, 2017, 16:01   #24
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I remember folks insisting years ago that running the car empty of fuel would either immediately or very shortly thereafter destroy the hpfp. And that it would not be possible to restart without vcds priming. Well, a friend of mine has run her '10 jsw empty three times- and has racked up over 200k miles on the original hpfp. Each time she was able to restart by filling the canister and extensive cranking (Not enough to drain the battery). She hasn't run it empty in the last 100k- lessons learned. Not suggesting anyone do the same, but people can get carried away . Of course, this is coming from a guy who rarely uses a torque wrench (and never strips fasteners or has them come loose).
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Old May 2nd, 2017, 09:57   #25
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I went about 45,000 miles without changing the fuel filter before the buyback.

Zero issues.
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Old May 2nd, 2017, 11:42   #26
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I went about 45,000 miles without changing the fuel filter before the buyback.

Zero issues.
I'm glad for you— but what happened to one person says nothing about what might happen to someone else who lets the filter go that long. I go to good station, get good fuel, and my car might go on the OEM filter until the wheels fall off. However, from reading this forum, it wouldn't take too much really bad fuel, or some water building up enough to be aspirated through the HPFP....then it would be lights out, a really expensive repair. I'll stick with changing my fuel filter every 20K (which is coming up before the end of the month, in fact) until we turn it in for the buyback.
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Old May 2nd, 2017, 11:55   #27
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I change mine every 10k, even though not required until 20k. I prime the pumps using VCDS.
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Old May 21st, 2017, 18:30   #28
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Just wanted to bring this thread to closure in case someone else finds it in the future. I ended up changing the filter at 72k miles, 32k miles since I changed it last. I used the VCDS to prime the pumps. Visually, the filter looked OK. I probably would have been fine to go quite a bit further on the filter. There were some dirt particles sitting in the bottom of the canister and no water was present.
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Old May 21st, 2017, 19:17   #29
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Originally Posted by kapps View Post
Just wanted to bring this thread to closure in case someone else finds it in the future. I ended up changing the filter at 72k miles, 32k miles since I changed it last. I used the VCDS to prime the pumps. Visually, the filter looked OK. I probably would have been fine to go quite a bit further on the filter. There were some dirt particles sitting in the bottom of the canister and no water was present.
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