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VW B5 Passat TDIs This is a general discussion about B5 Passat(>98 (2004-2005 in North America)). Non TDI related postings will be moved or removed.

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Old October 17th, 2011, 16:44   #1
MY1STVW
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Default Leaking Diesel Fuel from bottom of fuel filter housing

Does anyone know why I'm leaking diesel fuel from the bottom of my fuel filter. I remove my belly pan and noticed fuel on the pan. Removed the top engine cover and felt the bottom of the fuel filter and it was wet. Is this the drain port on the bottom leaking??
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Old October 17th, 2011, 16:53   #2
DickSilver
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The drain port loosens by unscrewing it, so try tightening. It has normal right-hand threads, but it is the devil to get at when the filter is in the car. Don't get murderous while twisting it: it is just nylon or some other plastic.

If it still drips, buy a new filter & install. There is a how-to thread if you need it.
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Old October 17th, 2011, 17:51   #3
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Okay I found the leak with your help DickSilver. The center dimple in the white plastic cap on the bottom of the fuel filter housing is cracked. I tighten the white plastic cap just a bit with my fingers and had someone key on the ignition to energize the fuel pump and found the leak in the cap itself. Does this white cap come with a new filter or do I have to order a new cap?
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Old October 17th, 2011, 18:16   #4
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The "white cap" is the drain valve to remove water from the filter. To be honest, I have never needed to use it. A new filter has a new drain valve.
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Old October 18th, 2011, 07:40   #5
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New filter every 20k miles...
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Old October 18th, 2011, 07:52   #6
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This past weekend a local member told me about his recent experience with the same issue. He surmised he had previously tightened the drain to much because he took the drain off and found the sealing o-ring split. Since the filter was relatively new he replaced the o-ring which fixed the leaking drain.
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Old October 18th, 2011, 18:32   #7
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This just happened to me too, last week. Dripping from the bottom even though the valve was tight. It was a Mehl, replaced it with a Hengst. Go Hengst!
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Old October 19th, 2011, 18:51   #8
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I would be just as happy if there was an optional filter with NO drain valve. There is almost no water in our fuel anymore anyway. Changing the fuel filter every 40K (20K seems anal-retentive to me) has always been good enough; never opened any drain valve.
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Old October 19th, 2011, 20:33   #9
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Why not double the maintenance period on every part then?
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Old October 23rd, 2011, 09:51   #10
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Dirt is the issue.

I have had three instances where a dirty fuel filter has caused a stumbling problem, once it was so bad the car went into limp mode. Each time, changing the filter made the issue go away (Confirmed on the old filters each time that there was no water in the filter). I drive 25k miles per year and replace the filter every November before the cold weather hits and I always keep one on the shelf in case.


Quote:
Originally Posted by DickSilver View Post
I would be just as happy if there was an optional filter with NO drain valve. There is almost no water in our fuel anymore anyway. Changing the fuel filter every 40K (20K seems anal-retentive to me) has always been good enough; never opened any drain valve.
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Old October 23rd, 2011, 10:05   #11
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White drain valve has normal metric threads. Get a bolt that fits and an oring and replace it.
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