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  #1  
Old 08-08-2009, 12:11 AM
sasquatchgeoff's Avatar
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Thall Shalt Not Over-Torque Thine Fuel Filter

see attached...

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Thall Shalt Not Over-Torque Thine Fuel Filter-p1010128.jpg  
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  #2  
Old 08-08-2009, 12:24 AM
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even if that o-ring failed.. what could happen? Isn't fuel pressure still the same within the filter?

Are you saying this is the cause to your nailing? ( you should update that thread then)

ps... what gorilla got a hold of that anyway??
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Old 08-08-2009, 12:46 AM
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The gorilla is me (see avatar) I think that you are probably correct in assuming that there has been no breach of fuel pressure, but there is a chance (slight) that rubber pieces could contaminate the circuit in some way.
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327K on 1986 W201, 602.911, 722.414 2.5 190D ("The Red Baron")
139K on 1993 W124, 104.942, 722.433 2.8 300E ("Queen")

http://farm5.static.flickr.com/4081/...0bb92d3c_m.jpg http://i370.photobucket.com/albums/o...g?t=1325284354

Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.
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  #4  
Old 08-08-2009, 01:01 AM
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is that inner o-ring intended to seal against the bolt, or against the filter housing surface?

seems like it should separate unfiltered fuel from filter fuel... ???
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Old 08-08-2009, 05:27 AM
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OK I'll bite ?

What is the proper torque for this fitting ?
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  #6  
Old 08-08-2009, 05:34 AM
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Quote:
Originally Posted by cessna5354 View Post
What is the proper torque for this fitting ?
Less than gorilla tight.
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  #7  
Old 08-08-2009, 10:03 AM
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Quote:
Originally Posted by cessna5354 View Post
What is the proper torque for this fitting ?

Tighten until you feel the threads start to strip, then back off a little bit.

And pray.

Jim
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  #8  
Old 08-08-2009, 10:46 AM
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Do not underestimate the work of gorillas, they are very intelligent animals. They are only one chromosome away from you.

That aside, Mr. Sasq. sent me an interesting pm. He thinks the return fuel supply may be more susceptible to being tainted and that once it is added to the mix in the fuel filter it could be causing problems. (ie.. nailing via air infiltration)

Does anybody have a work-flow diagram of this fuel system.. or at least a picture of the fuel filter housing showing the arrows?
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  #9  
Old 08-08-2009, 10:57 AM
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PM sent
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327K on 1986 W201, 602.911, 722.414 2.5 190D ("The Red Baron")
139K on 1993 W124, 104.942, 722.433 2.8 300E ("Queen")

http://farm5.static.flickr.com/4081/...0bb92d3c_m.jpg http://i370.photobucket.com/albums/o...g?t=1325284354

Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.
- Albert Einstein

take a walk down memory lane...
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  #10  
Old 08-08-2009, 11:44 AM
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where is Barry? I'm sure he would have some interesting things to say.


The way I see it... that whole system after the lift pump is under pressure... always. There are great fluctuations... but never vacuum to pull air into it.

The best I can conjure at the moment is that once the fuel reaches the injectors, gases that are released from suspension may be allowed to collect in the return lines or in the filter... if you had a bubble filling in the area around that o-ring... the next demand for fuel could suck it into the IP.

Low demand would be less likely to suck air down against gravity through that clear tubing into the iP.. while a greater demand has more of a chance to overcome gravity. This would also explain performance differences up and down steep hills.
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  #11  
Old 08-08-2009, 10:03 PM
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Quote:
Originally Posted by jt20 View Post
Do not underestimate the work of gorillas, they are very intelligent animals. They are only one chromosome away from you.
Well, thanks for that. I was referring to the fact that they are obviously much stronger than humans, and for them tight has a different meaning. Just, thanks for the DNA lesson.

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