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Go Back   TDIClub Forums > VW TDI Discussion Areas > Alternative Diesel Fuels (Biodiesel, WVO, SVO, BTL, GTL etc)

Alternative Diesel Fuels (Biodiesel, WVO, SVO, BTL, GTL etc) Discussions about alternative fuels for use in our TDI's. This includes biodiesel WVO (Waste Vegetable Oil), SVO (Straight Vegetable Oil), BTL (Biomass to Liquid), GTL (Gas to Liquids) etc. Please note the Fuel Disclaimer.

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Old May 25th, 2006, 23:15   #1
skurf
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Default How often should I change fuel filter?

I've been using B20 - B50 in the winter and B100 since it warmed up and was wondering how often I should change the fuel filter. I have 11k miles so far and have exclusively used biodiesel since I bought the car new.
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Old May 26th, 2006, 08:15   #2
ScorpionBoy
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pretty sure the interval is 10k
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Old May 26th, 2006, 08:27   #3
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The change interval is every 20k miles. Drain the water separator halfway between each replacement.
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Old May 26th, 2006, 09:17   #4
skurf
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So is it 10 or 20?

Quote:
Originally Posted by tditom
The change interval is every 20k miles. Drain the water separator halfway between each replacement.
How would I go about doing that?
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Old May 26th, 2006, 09:24   #5
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Your maintenance schedule can be found at vw.com. You have to select your model, and then click on "full schedule" at the bottom of the page.

The older fuel filters have a drain valve at the bottom of the filter. I'm not sure about your new Golf. do a search on the A5 forum
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Old May 26th, 2006, 09:25   #6
Fortuna Wolf
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pull the filter up, unscrew the white knob and let drain into a container.
Honestly, its not really necessary. I've never noticed water.
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Old May 26th, 2006, 09:28   #7
tditom
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I've never seen water either. That doesn't mean it shouldn't be done.

You also need to disconnect the "T" (keep the lines on it tho) on the A4. Not sure about A5 set up.

Last edited by tditom; May 26th, 2006 at 09:44. Reason: clarity
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Old May 26th, 2006, 09:29   #8
4Gman
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Its really easy.
Take out the Fuel filter and twist the little plastic spout on the bottom to let water out.

If you have an A4:

http://pics2.tdiclub.com/video/cincitdi/fuelfilter.html

IF you have an A5:

http://forums.tdiclub.com/showthread...fuel+filter+a5


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Old May 26th, 2006, 09:45   #9
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Drain the filter just to see if you have any H2O.... then go ahead and change it out for good measure. It doesn`t cost much and it is good maintance practice. You might wanna disect the old one just to see what it caught.
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Old June 2nd, 2006, 15:58   #10
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Why would you change the filter before it clogs? It seems to me the longer you leave the filter in, the better it filters. When you have a loss of power, change the filter. Maintenance schedules make $$$ for service departments.
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Old June 2nd, 2006, 16:13   #11
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Because a plugged filter make the injection pump work harder, and that shortens it's life.

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Old June 3rd, 2006, 06:49   #12
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Eh, I change all my filters (except oil) once a year in the spring, on the anniversary of buying the car. For me thats about 13k miles. Get the filter pack from tdiparts, and just be done with it.
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Old June 3rd, 2006, 07:19   #13
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Default 10k or 20k

VW says 20k but many of the biodiesel folks change it sooner. It will cost you more then the price of a filter if you car stops running on I-35 or Mopac some afternoon.

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Old June 3rd, 2006, 13:33   #14
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There's no need to change it sooner just because you run Bio. Dirty fuel, bio or not, will mandate more frequent changes. I've run commercial B20 for a year, and not a drop of water or piece of visible crud came out the drain when I swapped filters.
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Old June 10th, 2006, 12:43   #15
aberson
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Quote:
Originally Posted by Fortuna Wolf
pull the filter up, unscrew the white knob and let drain into a container.
Honestly, its not really necessary. I've never noticed water.
How much are you supposed to let drain?

I drained about 3 ounces out before I decided to stop. Upon examining the bottle, it looked like I had about 2 dropper-drops of water sitting at the bottom, and the rest was just diesel. Am I correct that the drain isn't just for draining water, but will actually drain all the fuel from the filter too?

I didn't have the suction device the video shows, and I didn't want to have tooo much air in my system by draining all the fuel out of my filter. The little air that was introduced seems to have worked out of the system after a few miles.
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