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Old December 28th, 2017, 18:17   #1
Gothmolly
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Default install thermo-tee fitting w/o leaks

My thermo-tee fitting on the fuel filter is ... wiggly, and it seems as if air could get in where the hose slides over the tee, despite the clamp.

Dabbing some grease on that junction, the air bubbles all but go away.

How do you ensure a good mating surface/seal?
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Dead radio? Pull fuse 42, wait 60 seconds.
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Old December 28th, 2017, 18:27   #2
IndigoBlueWagon
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If you have a good quality tee and filter you shouldn't have any leaks.
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Old December 28th, 2017, 18:33   #3
jettawreck
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I have a CAT filter conversion and have always had to use a heavy grease on the T fitting to keep the air bubbles minimized.
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Old December 28th, 2017, 18:40   #4
Gothmolly
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Quote:
Originally Posted by IndigoBlueWagon View Post
If you have a good quality tee and filter you shouldn't have any leaks.
The leaks are more around the tee going into the lines, not the filter itself. It's like the lines aren't tight enough. Maybe someone previously installed a crap tee?
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Dead radio? Pull fuse 42, wait 60 seconds.
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Old December 28th, 2017, 18:42   #5
Mongler98
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Nictane fuel filter uber kit
Nictane.com

or search for ditzel mod.
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Old December 28th, 2017, 18:45   #6
IndigoBlueWagon
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Or they're getting tired. With OE clamps they should be fine.
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Old December 30th, 2017, 08:54   #7
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I wrap the nipples on the T with Teflon pipe tape. I know it is not fully compatible with diesel fuel, but once you force the hose on and clap it down, it will last until the next filter change...
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Old December 30th, 2017, 09:13   #8
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I suspect that after 15 years hoses are starting to get a little less pliant. Should have seen the hose that I pulled from my diesel generator- it was B1 hose and at the ends it was like hardened, caramelized taffy, with some thin metal added!
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Old December 30th, 2017, 11:54   #9
Gothmolly
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It's always been a bear to remove the hoses from the fuel filter, maybe last time I beat them up? I'm seeing a constant stream of tiny bubbles coming into the clear line.
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Dead radio? Pull fuse 42, wait 60 seconds.
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Old December 30th, 2017, 12:17   #10
JB05
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I try to work around the T when changing the filter. Silicone spray will soften rubber hoses.
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Old December 30th, 2017, 13:22   #11
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Just replaced the fuel filter on a new to a co-worker '03 Jetta. I find the hoses get "stuck" on the filter and need to be gently twisted to free them up before pulling off. But the filter tee went in fine (OE filter made by UFI), and no bubbles or leaks.
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Old January 4th, 2018, 11:26   #12
Gothmolly
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I might pick up a new T next time I make a idparts order. For those of you who grease things to keep them airtight, are you greasing the T before inserting it into the hoses & clamping, or are you putting the hoses back on it, then covering the joint with grease?
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Old January 4th, 2018, 11:33   #13
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Just a light coat on the O-rings. Grease won't stop any leaks, it just keeps the rubber soft.
Sometimes the tee will hairline crack.
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Old January 4th, 2018, 12:00   #14
Gothmolly
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So your experience is that air is sucking in around where the T fits into the filter housing, not the hoses themselves?

I've always found the T fitting into the housing to be somewhat 'loose' even with that mouse-ears wire clamp thing holding it in. Is it supposed to have any play?
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!Vent, !DRL, 5 brake light mod, 11mm pump, RC3, Bosio Sprint 520s, VR6/G60 clutch, missing belly pan, leaky CCV, leaky valve cover, leaking door seals, broken glovebox, broken horn, rusted fender, dead rear windowwasher, frozen axle bushings
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Old January 4th, 2018, 15:39   #15
jettawreck
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Quote:
Originally Posted by Gothmolly View Post
So your experience is that air is sucking in around where the T fits into the filter housing, not the hoses themselves?

I've always found the T fitting into the housing to be somewhat 'loose' even with that mouse-ears wire clamp thing holding it in. Is it supposed to have any play?
Yes, I've never had the hoses leak that I've noticed. There always seems to be some "play" in the T fitting and o-ring connection. Some heavy grease has been the solution for mine. Yours and others results may vary, as they say.
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2001 Jetta TDI GLS Silver-current driver (salvage)permanently vented-Panzer Plate-Sprint 520s-ScanGauge-CheckTemp III-ZeroStart heater-CAT 2 filter
2003 Jetta GLS Black w/leather (New Project Car) fixer-upper w/broken TB
2004 Cadillac SLS (wife's)
1999 GMC Suburban (It's MN-you need one)
197? Shibura 2cyl diesel 4WD tractor-loader/brushhog (very handy unit)
196? International TD340 Dozer-w/Drott 4-in-1 bucket/back ripper attachment
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